PolyChain® GT Timing Belts - Walther Flender

THE POWER OF [E]MOTION
PolyChain® GT Timing Belts

Walther Flender Gruppe
PolyChain ® GT Timing Belts
Page Page 02
THE POWER OF [E]MOTION
We are in motion for you …
… with innovative, new service ideas and individual system solutions
which we develop together with you. The Walther Flender
Group stands for expertise, experience and commitment. With top
class technology and craftsman’s know-how in the areas of drive
and conveyor technology, bearing, clamping, and sintering technology,
in addition to the automotive sector. We‘re looking forward
to do more for you.
The Walther Flender Group – we are packaged know-how for drive,
conveyor, bearing and clamping technology as well as automotive
technology. For more than 70 years as a family company and a
market leader for timing belt drives, we have been offering a complete
product range: from individually manufactured single parts,
to drive assemblies and ready-to-install components, to industryspecific
complete solutions.
Complete expertise from engineering to implementation
A large proportion of our business today is made up of special
solutions. Experienced engineers from our development department,
but also mechatronic engineers and technicians advise you
comprehensively and develop a tailored concept based on your
requirements and assisted by powerful 3D CAD programs. The
products are tested in our own laboratories for their operational
characteristics under various conditions of use, and complete assemblies
are tested by means of computer supported simulations.
During this process we work closely together with you in order to
achieve the optimum result.
Comprehensive quality management
The entire Walther Flender Group with its four divisions is certified
to DIN EN ISO 9001:2000 and therefore fulfils the high quality
standards required by all of our customers. But you can expect
even more from us. Because individual quality assurance agreements
such as special sampling arrangements or companyspecific
performance clauses are equally a given for us. We are pleased to
make our quality management documentation available to you, in
order to ensure the maximum transparency.
New requirements bring new solutions
Markets are changing ever more quickly today. We help to shape
progress with innovations, flexibility and high service consciousness.
Our own company development department is involved with
new materials, processes and designs in order to optimise quality
and efficiency even more.
Service – as evident as it is first class
Availability is a key for business success. That is what we stand for
– with our logistics and project execution on the basis of the most
modern ERP systems. Furthermore, our consultants are accessible
to support you at all times. In the after-sales area, we support you
for example in adjusting the belt tension, checking the running
behaviour, or with important installation tips.
The Walther Flender Group – core skills
Drive technology: Timing belt drives, non-positive belt drives,
frequency inverters, gears, assemblies Conveyor technology:
Conveyor units, machine covers, system components Clamping
and bearing technology: Clamping sets, adjusting rings, sliding
bearings Automotive: Steering parts, wheel bearing sets, timing
belts, wiper blades, sensors
Further important information and news about the Walther Flender Group can also be found on the Internet at
www.walther-flender-gruppe.de

Walther Flender Gruppe
PolyChain ® GT Timing Belts
Table of contents Page
Introduction 04
General features 05
A glance at practice 06
Design characteristics 07
Timing belts 07
Design & components 07
Models 08
Timing belt pulleys 10
Standard timing belt pulleys 10
Timing belt pulleys – custom models 10
Manufacturing guidelines 11
Assembly & maintenance 14
Technical data 17
Power output values & belt lengths 17
Timing belt pitch 8MGT 17
Timing belt pitch 14MGT 20
Calculation & formulas 23
Standard line of timing belt pulleys 28
Pitch 8 mm 28
Pitch 14 mm 30
Models 32
Clamping sets 33
General features 34
Calculation instructions 34
Hub coefficient K 36
Description of models & tables 37
Causes of malfunctions 43
Product overview
Project data sheet
Important notice: PolyChain® timing belts are not suitable for use in
aircraft drive systems or other drive systems where a defective belt
could result in bodily injury.
Suitable protective measures must be taken to encapsulate exposed
drive systems from unintended access!
Note: All information in this catalogue is subject to change.
Technical details subject to change. Errors excepted.
44
45
Page Page 03

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE Page Page 04
4
Introduction
The new PolyChain® timing belt systems
present a line of timing belts that ensure
up to 8 times higher power transmission
as compared with classic drive systems;
with the same space requirements, up to
30 % more power can be transmitted than
with conventional PolyChain® GT belts.
PolyChain® synchronous belts can be used
in existing PolyChain® GT drive systems;
they use the same pulleys and require no
modifications to the drive.
In addition to the existing PolyChain® GT2
belts, with tensile fibres made of aramid
fiber, Walther Flender Antriebstechnik
GmbH has expanded its product portfolio
to include the new PolyChain® GT
Carbon belt. The tensile member of this
belt is made of carbon fibres, which enables
the transmission of very high forces in
a compact design.
The PolyChain® GT2 belt construction
is based on an innovative technological
design. The polyurethane mixture used
for the body and teeth of the belt is new
and unique. PolyChain belts are therefore
resistant to many oils, chemicals and fluids,
which means that they have clear advantages
over rubber timing belts in operating
conditions where they are exposed to
these substances.
Example: Paint stripper drive unit for skid conveyor systems
PolyChain® timing belts are available with
pitches of 8 mm and 14 mm and, with
a reliable power transmission of up to
950 kW, they set completely new standards
in many areas of mechanical engineering.
The completely maintenance-free and
smooth-running PolyChain® belts are especially
suitable as a replacement for slowrunning
chain drives with high torques.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE Page Page 05
5
General features
Positive power transmission
The positive meshing of the PolyChain®
belt teeth in the teeth of the drive pulleys
ensures the positive synchronous transmission
of power. Slippage and related deviations
in speed are eliminated.
Constant angular velocity
The PolyChain® timing belt wraps around
the timing belt pulley in a circular pattern
and not in the form of a polygon, preventing
periodic fluctuations and vibrations.
Cost effectiveness
Due to the high transmission capacity
of PolyChain® timing belt drive systems,
the pulley diameter and width can be
reduced substantially as compared with
other drive elements, saving additional
installation space within the machine
constructions.
With efficiency ratings as high as 98 %,
PolyChain® timing belts are modern drive
train elements that fully meet the trend for
energy-saving drive units.
Power and speed range
The power range of PolyChain® timing
belts extends from slow-running drive
units with extremely high torques, such
as those that are typical for heavy chain
drives, to high-performance drive units
with several hundred kW. Belt speeds of
more than 30 m/s are possible, in which
case it may be necessary to provide suitable
sound insulation.
.
.
No maintenance
While chain drives generally have to be
lubricated and require complex lubricating
systems even for relatively low peripheral
speeds, the PolyChain® timing belt drive
unit operates entirely without lubrication.
This minimizes the design and equipment
requirements, in addition to eliminating
contamination from the area around the
drive unit.
Noise level
The PolyChain® timing belt drive satisfies
requirements for low noise levels, as confirmed
by extensive tests in cooperation
with technical universities. The noise level
is reduced by the special profile of the Poly-
Chain® timing belt and by the capability of
Drehzahl der kleinsten Scheibe (1/min)
Speed of the smallest pulley (1/min)
Drehzahl der kleinsten Scheibe (1/min)
10000
5000
1000
100
10
10000
5000
1000
100
10
PC-8MGT2
PC-14MGT2
0,1 1 10 100 1000
Berechnungsleistung (kW)
Calculated power output (kW)
Diagram 1: Selection diagram: belt pitch PolyChain® GT2
Speed of the smallest pulley (1/min)
PCC-8MGTC
PCC-14MGTC
maintaining the same power transmission
with a narrower belt than those used in
other systems. At high belt speeds, various
options are available for reducing noise;
please ask our application engineers.
Constant belt tension
Since PolyChain® timing belts do not elongate
due to permanent plastic deformation
when used within the permissible power
range, the belt tension remains constant
once the belt has been adjusted. Due to
minimal stretching during the wear-in
period, the belt tension can decrease
slightly; one-time re-tightening is necessary
only in exceptional cases, eliminating
expensive and time-consuming maintenance
at regular intervals.
0,1 1 10 100 1000
Berechnungsleistung (kW)
Calculated power output (kW)
Diagram 2: Selection diagram: belt pitch PolyChain® GT Carbon TM
10000
.
10000
.

Walther Flender Gruppe
PolyChain Page
® GT Timing Belts PAGE 06
A glance at practice
From a belt width of 125 mm to 68 mm: Efficient and costeffective
drive technology due to innovative carbon tensile
member
By using the new PolyChain® Carbon TM timing belt in a heavyduty
metal saw, the drive technology engineers at Walther Flender
Antriebstechnik achieved cost reductions of up to 25 % and therefore
more than satisfied the customer‘s requirement for a highperformance
and economical timing belt drive system.
With a maximum saw blade diameter of 2.2 meters, the metal saw
of a well-known Austrian component manufacturer is certainly
one of the largest saws on the market. The customer designed the
saw with a time-tested PolyChain® timing belt drive unit. The belt
width was 125 mm. Due to the maximum transferable power of
517.4 kW, the PolyChain® timing belt used for the system achieved
a safety factor of 3.27.
Based on the product presentation of the new PolyChain® GT
Carbon belt and extensive technical advice from the Walther
Flender Antriebstechnik sales engineers, the customer decided to
rethink the existing drive unit and to have it checked by the WF
drive technology engineers.
An analysis of the existing design showed that the drive unit was
overrated with the aforementioned safety factor. A safety factor
of 2.0 is fully adequate for this type of drive unit. As a result, one
of two alternative designs with the new PolyChain® GT Carbon
timing belt was chosen.
The design of the belt drive unit made optimal use of the advantages
of the new PolyChain® GT Carbon TM timing belt.
The WF drive technology engineers designed a drive with identical
technology to the existing drive unit with a safety factor of 3.06,
optimizing the system with an adequate safety factor of 2.3. In
the first case, the use of the Carbon timing belt made it possible
to reduce the original belt width from 125 mm to 90 mm, which
reduces costs by about 14 % due to the smaller belt pulleys. In the
optimized design, a timing belt with a width of 68 mm already
achieves the required drive power. This even made it possible to
reduce the costs by 25 %.
The timing belt is driven via the corresponding PolyChain timing
belt pulleys. The belt pulleys are equipped with special teeth that
are precision-cut in the gear hobbing process. Only original timing
belt pulley hobbing cutters are used. Only these original tools
ensure a reliable and long-lasting timing belt drive unit.
The modified timing belt drive unit has passed all test runs so far
and the customer is already convinced of the high performance of
the carbon belt and the advanced technological expertise of the
Walther Flender drive technology engineers.

Walther Flender Gruppe
PolyChain Page
® GT Timing Belts PAGE 07
Design characteristics
Timing belts
Design & components
1. The tensile member of the PolyChain®
GT Carbon TM belt is made of carbon fibres,
as opposed to the PolyChain® GT2 belt,
which has a tensile member consisting
of aramid fibres. Both fibre types give
the belts their outstanding performance
properties. In addition to exceptional bending
fatigue strength, the tensile members
feature high notch impact strength so
they also resist impacts and vibrations.
Unlike polyester, aramid and carbon fibres
are thermally stable and can be used at
extreme temperatures. They are chemically
neutral and therefore resistant to oils,
chemicals, dirt and corrosion. Both aramid
and carbon fibres have a higher E-module
than steel cord, with minimal stretching.
2 3
2. The elastic mixture from which the
back and the cogs of the belt are made is
a polyurethane specially developed and
optimized for good adhesion to the cord
and fabric.
It is:
• highly resistant to chemicals, oils and dirt
• highly resistant to abrasion and therefore
extremely durable
• fully serviceable even at extreme
temperatures (–54 °C to + 85 °C)
3. The surface of the PolyChain® belt is a
specially woven and impregnated nylon
fabric, which reduces friction on the timing
belt pulleys and prevents heat build-up.
This highly abrasion-resistant fabric makes
the PolyChain® belt absolutely maintenance-free
and smooth-running. During
the wear-in period, the nylon fabric, which
is specially impregnated in the production
process, can show minimal signs
of abrasion, especially at very high belt
speeds. This abrasion is wholly acceptable
and usually stops after only a few hours of
operation.
Note:
With the PolyChain® GT Carbon belt, idler pulleys can be used as reverse idlers. However, PolyChain® GT2 belts are sensitive to
the use of reverse idlers. Please observe the handling instructions especially with respect to storage and assembly.
1

Walther Flender Gruppe
PolyChain Page
® GT Timing Belts PAGE 08
Models
Endless design
Pitches
PolyChain® endless timing belts are manufactured with 8 mm and
14 mm pitches and are available in a large assortment of lengths
and widths.
The main dimensions of the timing belt are:
Pitch – Pitch length – Width
The timing belt pitch is the distance in millimeters between two
adjacent tooth centres, measured on the timing belt pitch line.
The pitch length is the total circumference of the timing belt in
millimeters, measured on the belt pitch line. The theoretical pitch
line of a PolyChain® timing belt is in the centre of the tensile
member.
The available timing belt lengths and standard widths are listed on
pages 19 and 22.
Dimensions
Pitch (mm)
h s
t
(mm)
h t
(mm)
Width tolerances
For both 8 mm and 14 mm pitches, the tolerance is ±3 % of the
belt width.
Length tolerances
(in relation to the centre distance of axes; specified in mm)
Belt length Tolerance
h S
(mm)
8 8 3.4 5.9
14 14 6.0 10.2
h t
t
up to 762 +/- 0,30
above 762 to 1016 +/- 0,33
above 1,016 to 1,270 +/- 0,38
above 1,270 to 1,524 +/- 0,41
above 1,524 to 1,778 +/- 0,43
above 1,778 +/– 0.43 mm ± 0.03 mm
for every 254 mm
level for 1778 mm and above
To use PolyChain® timing belts with fixed centre distances of axes,
please consult our application engineers.
Weights per metre in kg for PolyChain® GT2
Pitch
(mm)
Weights per metre in kg for PolyChain® Carbon TM
The weights per metre can vary slightly depending on the belt
construction and the tolerance positions.
The ordering designation includes the pitch, pitch length and
belt width:
PolyChain® GT2
Example: PC-8MGT 640 - 12
or PC-14MGT 1190 - 37
PolyChain® GT Carbon TM
Example: PC-8MGT 640 - 12 Carbon
or PC-14MGT 1190 - 37 Carbon
Pitch
(mm)
Belt width (mm)
12 20 21 36 37 62 68 90 125
8 0.057 - 0.099 0.170 - 0.293 - - -
14 - 0.158 - - 0.292 - 0.536 0.709 0.985
Pitch
(mm)
Belt width (mm)
12 20 21 36 37 62 68 90 125
8 0.056 - 0.099 0.169 - 0.291 - - -
14 - 0.158 - - 0.292 - 0.537 0.711 0.987
Pitch length
(mm)
Width
(mm)
8 M 640 12
14 M 1190 37

Walther Flender Gruppe
PolyChain ® GT Timing Belts
Open-ended model (LongLength)
Pitches
PolyChain® GT2 Long Length (LL) timing belts are available with
8 mm and 14 mm pitches.
Dimensions and weights
Designation Standard
widths
(mm)
For information about dimensioning for special applications
requiring other dimensions, please consult our application
engineers.
Technical information
Permissible tangential loads in newtons
(8M: 21 mm belt width, 14M: 37 mm belt width)
* Minimum number of teeth 22 (8M) or 28 (14M)
Minimum tensile strength in newtons
Ordering designation
The ordering designation includes the belt width, pitch length
and roll length:
Example:
Weight per
metre in g
(10 mm
belt width)
Number of pulley teeth
Pitch 22 26 28 30 34 38 40 ≥ 44 ≥ 52
8M 3097* 3151 3206 3237 3269 3278
14M 9900* 10 204 10400 10599
Belt width in mm
Pitch 12 20 21 36 37
8M 5787 11 254 19291
14M 20568 38054
PC-21-LL-8M 30M
Maximum
roll
length
t
(mm)
h t
(mm)
Width (mm) Pitch (mm) Roll length (mm)
21 8M 30M
Technical data of the PolyChain® Carbon TM Long Length timing
belt is available on request.
h S
(mm)
PC-LL-8M 12 21 36 47.0 30 m 8 3.4 5.9
PC-LL-14M 20 37 37 30 m 14 6.0 10.2
PAGE Page 09

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 10
Timing belt pulleys
PolyChain® timing belt pulleys are equipped with special precision-cut
teeth in the gear hobbing process. Only original timing
belt pulley hobbing cutters are used. Only these original tools
ensure a reliable and long-lasting timing belt drive unit.
Only PolyChain® timing belts and PolyChain® timing belt
pulleys with the same pitch can be used together.
The main features of the timing belt pulley are:
Number of teeth, pitch, width, design
The pitch of the timing belt pulley is measured on the pitch
diameter and is the distance between the centres of two adjacent
hollows. The pulley pitch diameter is always outside the outer diameter
of the timing belt pulley and is congruent with the timing
belt pitch line.
Pitch diameter
Outer diameter
Pitch
Timing belt pulleys – standard and custom models
Pitch line
Standard timing belt pulleys are adequate for the requirements of
many drive systems with respect to functionality and space conditions
and are available on a short-term basis.
For heavy-duty, precise drives requiring exact positioning, however,
we recommend custom timing belt pulleys that we manufacture
according to your drawings. Numerous custom teeth are available,
for example for essentially backlash-free or quiet drive systems.
In addition to the standard cast, aluminum and steel timing belt
pulleys, pulleys made of numerous other materials, also with surface
treatment, are available. Please ask our application engineers.
Due to the high specific bearing percentage, standard aluminum
(e.g. AlZn5,5MgCu) should generally be surface treated, for example
hard coated, to ensure high wear resistance.
For shaft and hub connections, we offer an extensive line of
self-centring clamping sets: an overview of models can be found
starting on page 37.
Standard timing belt pulleys
The information on pages 23 to 26 describes our extensive line of
standard timing belt pulleys with and without taper lock clamping
bushes.
Standard pulleys are available for the following belt widths:
Pitch designation 8M 14M
Nominal belt
width in mm
Standard timing belt pulleys are statically balanced; for drive
systems with v > 30 m /s, please ask.
Ordering designation
The ordering designation for PolyChain® timing belt pulleys
includes the following:
Pitch Number of
teeth
12 37
21 68
36 90
62 125
8M - 48S - 36 3F
Pulley width designation
(mm)
Timing belt pulleys – custom models
Design
8M 48 36 3F
Although the PolyChain® standard timing belt pulleys are available
with different numbers of teeth and pulley designs for a broad
range of applications, many applications require custom solutions
with specially designed pulleys.
We have adapted our production facilities to accommodate
such solutions.
We can deliver any timing belt pulley you require, based on your
drawings; special processing, such as grinding, balancing or surface
treatment, is also available.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 11
Manufacturing guidelines
Due to the high belt loads and speeds that can occur, the use of
non-wearing materials is preferable.
We offer an extensive selection of pulleys made of steel, sintered
metal and polymer, in addition to high-strength aluminum.
The specified minimum pulley diameters should always be
observed: 60 mm for 8 mm pitch and 130 mm for 14 mm pitch.
Recommended pulley widths
Tooth code
designation
8M
14M
Pulley
width
designation *
Smallest tooth
width
G
mm
Smallest pulley
width with
rim flanges**
E
mm
12 14 18
21 23 27
36 38 42
62 65 70
20 23 27
37 40 46
68 71 77
90 95 101
125 130 136
* Corresponds to the nominal belt width in mm.
** The specified pulley widths include a material allowance for
producing the rim flanges and should always be taken into
account.

Walther Flender Gruppe
PolyChain ® GT Timing Belts
Position & shape tolerances
The tooth surface quality, dimensional accuracy and pitch accuracy
and the position and shape tolerances of the timing belt pulley
have a significant influence on how smooth the drive system
operates.
Since the outer diameter of the pulleys is also surface milled
during the hobbing process, turning produces blanks that are
larger than the finished product.
In finished state, the outer diameter has an especially close
tolerance.
– Tolerances of standard timing belt pulleys
Outer diameter (mm) Permissible deviation (mm)
above to
50 100 + 0.10
101 175 + 0.13
176 300 + 0.15
301 500 + 0.18
501 800 + 0.20
– Tolerances for custom timing belt pulleys
all dimensions in mm
Outer diameter (mm) Permissible Permissible
Rough
above to tolerance concentricity tolerance allowance da+
50 100 + 0.08 0.05
101 150 + 0.10 0.07
151 200 + 0.12 0.1
201 300 + 0.15 0.12 + 1.0 mm
301 500 + 0.18 0.03 pro
501 . . . + 0.20 100 mm
– Run-out tolerance
Outer diameter range
(mm)
Permissible deviations
(mm)
to 101.60 0.10
above 101.60 0.1 + 0.1 mm
to 250.00 per 100 mm outer diameter
0.25 + 0.05 mm
above 251.00 per 100 mm outer diameter
– Bore dimensions of standard pulleys
We recommend a tolerance in the range of IT 7 for the final bore.
– Temperature expansion coefficient a
of the timing belt pulley materials
Thermal effects of the drive system can cause thermal expansion
of the pulley diameters, which can affect the belt
tension. Therefore, you should take into account the following
thermal expansion coefficients in case of extreme tempera ture
fluctuations:
Steel: 12,0 · 10 –6 1/K
Aluminum: 23,5 · 10 –6 1/K
– Balancing
Rotationally symmetric timing belt pulleys machined on all sides
for standard drive systems do not need to be balanced.
High-speed timing belt pulleys for precise drive systems are
balanced according to DIN/ISO 1940 (previously VDZ 2060).
In case of a quality grade of less than 6.3, please contact our
application engineers.
Runout
Concentricity
Outer diameter
PAGE 12

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 13
Rim flanges
Rim flanges for belt guidance
Poly Chain® timing belt pulley drive systems are designed with
a double flanged pulley for guiding the timing belt. To reduce
costs, the smaller timing belt pulley is frequently provided for this
purpose.
It should be noted, however, that the driven timing belt pulley
should always be equipped with double flanges, since this makes
it easier to guide the slack side. For very large centre distances
of axes (> 8 · d) and transmission ratios of 1 : 3 or higher and for
vertical shaft positions, both timing belt pulleys should have
double flanges.
We offer an extensive standard line of galvanized steel flanges;
please use the rim flange dimensions in the following tables for
your design.
The rim flanges are bevelled for better guidance of the timing
belt when it runs onto the pulley. Straight rim flanges sometimes
have the disadvantage that, if the shaft is not aligned precisely,
the belt tooth can run onto the inside edge of the flange, resulting
in premature wear. Therefore, we do not recommend using straight
rim flanges without a bevel.
Poly Chain® 8M
Number of teeth Code A (mm) B (mm) C (mm) s (mm)
22 18 L 48 54 60 1.5
23 14 H 47 57 63 1.5
24 15 H 51 60.5 66.5 1.5
25 16 H 53 64 71 1.5
26 – 27 17 H 57 68 75 1.5
28 – 29 18 H 60 72 79 1.5
30 19 H 64 76 83 1.5
31 – 32 20 H 68 79 87 1.5
33 21 H 73 84 91 1.5
34 – 35 22 H 76 88 93 1.5
36 23 H 79 91 97 1.5
37 – 38 24 H 82.5 96 103 1.5
39 – 40 25 H 87 100 106 1.5
41 – 42 26 H 91 105 111 1.5
43 27 H 97 109 115 1.5
44 – 45 28 H 99 114 119 1.5
46 – 48 30 H 107 121 127 1.5
49 – 51 32 H 116 129 135 1.5
52 – 53 33 H 120 134 140 1.5
54 – 55 34 H 126 139 146 1.5
56 – 57 36 H 132 145 152 1.5
58 – 61 38 H 140 154 160 1.5
62 – 64 40 H 148 161 168 1.5
65 – 67 42 H 156 170 176 1.5
68 – 70 44 H 164 177 184 1.5
71 – 73 46 H 172 186 192 1.5
74 – 77 48 H 180 195 200 1.5
78 – 83 L216 190 – 216 2
84 – 92 L238 200 – 238 2
93 L260 210 – 260 2.5
94 – 99 L260 S 230 – 260 2
100 – 107 L280 230 – 280 2.5
xmin = 6.0 mm
Ø C ± 0.5
D min = 0.5
Ø B ± 0.5
Ø A ± 0.15
D
8°min
25°max
S
x min.
Outer Ø
D min : Minimum material overlap for functional rolling of rim flange
Note: depending on the angle, the outer edge of the rim flange
may not be flush with the front face of the timing belt pulley!
Poly Chain® 14M
Number of teeth Code A (mm) B (mm) C (mm) s (mm)
28 L138 105 – 138 2.5
29 – 30 L142 90 – 142 2.5
31 – 32 L156 105 – 156 2.5
33 – 34 L172 115 – 172 2.5
35 – 38 L186 130 – 186 2.5
39 – 43 L200 144 – 200 2.5
44 – 46 L215 160 – 215 2.5
47 – 49 L230 190 – 230 2.5
50 – 52 L242 185 – 242 2.5
53 – 55 L260 210 – 260 2.5
56 – 59 L280 230 – 280 2.5
60 – 64 L300 250 – 300 2.5
65 – 68 L320 260 – 320 2.5
69 – 73 L340 280 – 340 2.5
74 – 79 L372 300 – 372 2.5
80 – 84 L385 330 – 385 2.5
85 – 92 L420 360 – 420 2.5
> 92 no standard flange, flange has to be adapted.
xmin = 6.0 mm

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 14
Assembly & maintenance
Installation
Proper handling during installation of the timing belt is very
important. Avoid bending, twisting, winding or kinking the belts.
Under no circumstances should force be applied to put the timing
belt on the pulleys.
Installation guidelines
For the belt to run straight, it is essential to carefully align the
shafts and timing belt pulleys so they are parallel. Impermissible
deviations from parallel cause different edge tensions in the belt,
causing the belt to run off toward the side with the highest tension
or to run up against the flange. At high speeds, the latter can
cause excessive noise and excessive wear of the belt. In the case of
larger centre distances of axes, it is more difficult to align the shafts
precisely, increasing the tendency for the timing belt to run off to
one side. Therefore, take measures to ensure that the belt does not
run off the face of the timing belt pulleys. It may be necessary to
move the driven pulley slightly.
Electrical conductivity
Tests have shown that PolyChain® timing belts do not conduct
electricity under dynamic operating conditions. This can result
in static electricity with uncontrolled malfunctions. If PolyChain®
timing belts are used in potentially explosive areas, we recommend
taking measures to ensure that no electrical charge can
occur before operating the system. This means that the entire
system has to be properly earthed.
Ambient influences
Temperatures
PolyChain® timing belts can generally be used in a temperature
range between –54 °C and +85 °C. For operating conditions outside
of this temperature range, please contact us.
Chemical resistance
Field and lab tests guarantee resistance against many acids, caustic
solutions, grease and oil. Of course, the service life and durability of
the timing belt also depend on the concentration of the substance
to which it is exposed (e.g. droplets, spray or constant immersion).
For special applications, please ask our application engineers.
Adjustment tolerances
Since fixed (non-adjustable) centre distances of axes can be
recommended only for slow-running drive systems, the use of
a PolyChain® timing belt drive system requires that the timing
belt can easily be installed and that the belt tension can be
precisely adjusted. The mounting dimension must allow for easy
mounting of the belt on a timing belt pulley with rim flanges.
max. 0.25°
max. 5 min. / 1 m
The minimum dimensions for the respective centre distances of
axes are listed in the tables below. The travel of the centre distance
of axes for mounting and adjustment of the belt tension is shown
in the right column.
Adjustment tolerances without rim flange
Belt length
(mm)
to
1000
from 1000
up to 1780
from 1780
up to 2540
from 2540
up to 3300
from 3300
up to 4600
Travel (mm) for
mounting the
timing belt
Adjustment tolerances with rim flange
Pitch Rim flanges on one
timing belt pulley
(mm)
Travel (mm) for
adjusting the timing
belt tension
1.8 0.8
2.8 0.8
3.3 1.0
4.1 1.0
5.3 1.3
Rim flanges on both
timing belt pulleys
(mm)
8 mm 21.8 33.3
14 mm 31.2 50.0
Fixed centre distance of axes
Belts with a pitch of 8M can be used up to a pitch length of
ca. 1,600 mm for slow running drives (n ≤ 100 rpm) with fixed centre
distances of axes; the tolerance for the centre distance of axes
should be within the calculated range of 0 to –0.2 mm. Since the
pulley diameter should also be within close tolerances, please ask
our application engineers.
Idlers
Idlers should only be used on drive systems with a fixed centre
distance of axes and should be mounted on the inside of the slack
side. We recommend using idlers with up to 40 teeth. For larger
diameters, smooth idlers without teeth can also be used. An idler
exerting force on the back should not be used with aramid belts,
since they have a negative effect on the service life due to the
special construction of the timing belts. For carbon belts, the minimum
diameter for outer idlers is 70 mm for a pitch of 8 mm and
150 mm for a pitch of 14 mm. Inner idlers should not be smaller
than the smallest power transmitting timing belt pulley. To maximize
the number of meshing teeth on the small timing belt pulley,
it is recommended to position the idler near the large pulley on
the slack side. If the belt touches the idler with only one tooth, this
can result in high noise levels. It is better to have several belt teeth
mesh with the pulley.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 15
Belt tension
The Poly Chain® timing belt needs a certain tension during operation
to maintain reliable engagement of the teeth also under
intermittent loads and temporary overloads. Unnecessarily high
initial tension reduces the service life of the drive system, increases
wear on the bearings and the teeth, and also increases the noise
level. Insufficient tension can prevent the belt teeth from meshing
properly in the pulley teeth, which can even cause the belt to
skip in case of an overload. Depending on the application and the
particular dynamic peak loads, the belt tension can deviate from
the calculated initial tension, so that the calculation provided here
should be used only as a recommendation for standard applications.
This applies especially to drive systems with extreme impact
and pulse loads; in this case, please contact us.
Calculation of the static initial load
F St = K · P + m · v 2
v
F St [N] = Static initial tension
P [kW] = Installed motor power output
v [m/s] = Belt speed
m = Factor for weight per metre, see table
K = Constant for compensating for
impact loads
K = 600 max. initial tension for compensating for pulse loads
Pitch Belt width (mm) m Y
8 mm 12 0.057 80
21 0.098 140
36 0.167 240
62 0.290 413
14 mm 20 0.158 245
37 0.291 454
68 0.536 834
90 0.711 1103
125 0.986 1530
Table: Calculation factors for belt tension
If the transmission capacity is significantly higher than the calculated
capacity of the belt, the calculations can result in incorrect
belt tensions. In this case, please use the minimum initial tensions
specified in the following table:
Pitch Belt width (mm)
8 mm
14 mm
Min. F st
Values (N)
12 125
21 220
36 375
62 645
20 530
37 980
68 1800
90 2380
125 3310
Table: Minimum initial tension of PolyChain® timing belts
Checking the belt tension
Two methods can be used for checking the belt tension:
1. Frequency measurement and 2. Test load method
1. Frequency measurement
A precise method for pre-setting the correct belt tension is to
measure the frequency with the WF Tension Meter (Figure 1) or
the Gates-Sonic Tension Meter (Figure 2). With a sensing head
that is held above the installed belt it is possible to measure the
frequency at the pre-tensioned belt in order to achieve the optimum
belt tension.
The calculated oscillation frequency f [Hz] depends on the freely
oscillating span length L [m], the static initial tension load FSt [N]
and the weight per meter m [kg/m] of the belt and corresponds
to the relationship
f = 1 · √ F St
2 · L m
For a detailed description of the instruments and detailed calculation
documentation, please contact our application engineers.
2. Test load method
Calculation of deflection
S = √A2 – [ dwG – d 2
wk ]
2
S : Span length for test force measurement (mm)
d : Deflection (mm)
dwk : Pitch diameter of the small pulley (mm)
dwG : Pitch diameter of the large pulley (mm)
FP : Test force (N)
A : Centre distance of axes (mm); separate tables are available
for the calculation and will be provided on request.
If the span tension is set correctly, the deflection is
d ~ 1 / 100 · S
Calculation of test force
Figure 1:
WF Tension Meter
S
d
FP
Figure 2:
Gates Sonic Tension
Meter 507C
F St + S · Y F P : Test force (N)
F P = l w F St : Static initial tension
25 l w : Pitch length (mm)
Y : Constant (see table)
Adjusting the initial tension
For the calculated test force, the deflection should be ca. 1/100 of
the span length [mm] of the test force measurement. It may be
necessary to correct the belt tension.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 16
Storage & maintenance
PolyChain® timing belts require no special maintenance. During the wear-in period of heavy-duty drive systems there may be some
reduction in the belt tension; in this case, it is necessary to retighten the belts only once with 50 % of the original initial tension.
When storing belts, they should never be kinked or folded tightly, because this can damage the tensile members. Therefore, we recommend
that timing belts be stored in the original package until needed; during storage, belts should be protected from extreme temperatures,
humidity and UV radiation.
Clamping elements
For secure fastening of the timing belt pulley to the shaft, you can
use the conventional feather key connection or any number of
frictionally engaged, removable clamping elements for all standard
bore dimensions.
In addition to the TL (TaperLock®) bushes used primarily for standard
pulleys, we offer an extensive line of cylindrical inner and outer
clamping sets, which are especially suitable to fulfil requirements
for optimal true running properties.
Please note the required minimum hub and minimum wall thicknesses
to ensure reliable use of the clamping sets; please contact
us before using aluminum pulleys.
Further information on our clamping sets can be found starting
on page 33.
Advantages of the positive locking cylindrical clamping
elements:
– Easy mounting and removal
Mounting and removal by tightening or loosening the clamping
screws using conventional tools. A precise torque can be achieved
by using a torque wrench.
Oil the clamping set lightly when mounting it. Do not use oil containing
molybdenum disulfide and do not use grease.
– Backlash-free connection
The clamping sets provide a positive-locking, backlash-free connection
that can be released at any time.
– Large machining tolerances
The following fitting combinations are recommended:
Tolerances in the shaft diameter: h 7/h 9
Tolerances in the hub bore diameter: H 7/H 9
Surface roughness ≤ RZ 16
The runout error is between 0.02 and 0.04 mm, depending on the
model; all clamping elements listed here are self-centring.
– High fatigue strength
No weakening of the shaft and pulley bore by keyways.
– Easy adjustment
Since no profile end mating is necessary, the components can
be fastened at a precise angle in any required position.
– Overload protection
If the maximum torque is exceeded, slippage of the clamping
set prevents damage to the connected parts. Repeated slipping
should be avoided.
– Economical connection
An economical shaft/hub connection, due to ease of
manufacturing the smooth cylindrical shaft and bore fit.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 17
Technical data
Power output values & belt lengths
Timing belt pitch PC - 8MGT and PC - 8MGT Carbon
Calculation of the dimensions and design of belt drive units can
be based on the motor side (motor power output) and on the
load side (load collectives). Both calculations – depending on
the existing safety factors, desired service life or any load- side
efficiency losses – can result in designs for drive systems with
Maximum permissible tangential loads
The values listed in the following tables represent the operationally
useable tangential loads. The listed values apply to quasistatic
loads, i.e. for low speed ranges (n ≤ 100 rpm) with the use of
timing belt pulleys with at least 34 teeth.
PolyChain® GT2
Belt width (mm) 12 21 36 62
Fzul (N) 2012 3521 6037 10397
Power output in kW / 12 mm belt width
Note: The following power output data was obtained in extensive
series of tests on the basis of defined service life values and
includes safety factors that were defined internally beforehand
to achieve the corresponding service life. Therefore, the power
PolyChain® GT2
Speed
of the
small
pulley
different overall widths. In addition to the load value calculation,
therefore, we also recommend that you use the following power
output table to compare the actual tangential loads with the
maximum permissible loads.
The initial tensions for mounting of the belts are already included
in the power output values and do not have to be subtracted from
the listed values.
PolyChain® GT Carbon
Power output of the small timing belt pulley
Belt width (mm) 12 21 36 62
Fzul (N) 2404 4208 7213 12431
output data cannot be compared directly with data of other
manufacturers; if you have any questions, please contact our
application engineers.
22 25 28 30 32 34 36 38 40 45 48 50 56 60 64 75 80
56.02 63.66 71.30 76.39 81.49 86.58 91.67 96.77 101.86 114.59 122.23 127.32 142.60 152.79 162.97 190.99 203.72
10 0.10 0.12 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.23 0.24 0.25 0.29 0.31 0.33 0.39 0.41
20 0.16 0.18 0.21 0.23 0.24 0.26 0.28 0.29 0.31 0.35 0.38 0.40 0.45 0.48 0.51 0.60 0.64
40 0.25 0.30 0.34 0.37 0.40 0.43 0.46 0.48 0.51 0.58 0.63 0.66 0.74 0.80 0.85 1.00 1.07
60 0.34 0.40 0.46 0.50 0.54 0.58 0.62 0.66 0.70 0.80 0.86 0.90 1.02 1.09 1.17 1.38 1.48
100 0.51 0.60 0.70 0.76 0.82 0.88 0.94 1.00 1.07 1.22 1.31 1.37 1.54 1.66 1.78 2.10 2.25
200 0.90 1.07 1.24 1.35 1.47 1.58 1.69 1.80 1.91 2.19 2.35 2.46 2.78 3.00 3.21 3.79 4.05
300 1.26 1.51 1.75 1.91 2.07 2.23 2.39 2.55 2.71 3.10 3.33 3.49 3.95 4.26 4.56 5.39 5.76
400 1.61 1.92 2.24 2.45 2.66 2.86 3.07 3.27 3.48 3.98 4.28 4.48 5.08 5.47 5.87 6.93 7.41
500 1.94 2.33 2.71 2.97 3.22 3.47 3.72 3.97 4.22 4.84 5.21 5.45 6.18 6.66 7.13 8.43 9.02
600 2.26 2.72 3.17 3.47 3.77 4.07 4.36 4.66 4.95 5.68 6.11 6.39 7.25 7.81 8.37 9.90 10.58
700 2.58 3.11 3.63 3.97 4.31 4.65 4.99 5.33 5.66 6.50 6.99 7.32 8.30 8.94 9.59 11.33 12.12
730 2.67 3.22 3.76 4.12 4.47 4.83 5.18 5.53 5.87 6.74 7.25 7.59 8.61 9.28 9.95 11.76 12.58
800 2.89 3.48 4.07 4.46 4.84 5.23 5.61 5.99 6.36 7.30 7.86 8.23 9.33 10.06 10.78 12.75 13.63
900 3.19 3.85 4.50 4.93 5.36 5.79 6.21 6.63 7.05 8.09 8.71 9.12 10.35 11.15 11.96 14.13 15.11
1,000 3.49 4.22 4.93 5.41 5.88 6.34 6.81 7.27 7.73 8.88 9.56 10.01 11.35 12.23 13.11 15.50 16.58
1,200 4.07 4.93 5.77 6.33 6.88 7.43 7.98 8.53 9.07 10.41 11.21 11.74 13.31 14.35 15.38 18.18 19.44
1,400 4.64 5.62 6.59 7.23 7.86 8.50 9.12 9.75 10.37 11.91 12.82 13.43 15.23 16.42 17.60 20.79 22.22
1,460 4.81 5.82 6.83 7.49 8.15 8.81 9.46 10.11 10.76 12.35 13.30 13.93 15.80 17.03 18.25 21.56 23.04
1,600 5.19 6.30 7.39 8.11 8.83 9.54 10.24 10.95 11.65 13.38 14.41 15.09 17.11 18.44 19.76 23.34 24.94
1,800 5.73 6.96 8.17 8.97 9.77 10.56 11.34 12.12 12.90 14.82 15.96 16.71 18.95 20.42 21.88 25.83 27.58
2,000 6.27 7.61 8.94 9.82 10.69 11.56 12.42 13.28 14.13 16.23 17.48 18.30 20.75 22.36 23.96 28.25 30.16
2,400 7.30 8.88 10.44 11.48 12.50 13.52 14.53 15.53 16.52 18.98 20.44 21.40 24.25 26.13 27.97 32.93 35.13
2,800 8.29 10.11 11.90 13.08 14.25 15.41 16.57 17.71 18.85 21.65 23.30 24.39 27.63 29.74 31.82 37.38 39.82
2,880 8.49 10.35 12.19 13.40 14.60 15.79 16.97 18.14 19.30 22.17 23.86 24.98 28.28 30.44 32.57 38.24 40.73
3,200 9.26 11.30 13.31 14.64 15.95 17.26 18.55 19.83 21.10 24.22 26.07 27.28 30.87 33.20 35.50 41.58
3,500 9.97 12.18 14.35 15.78 17.20 18.60 20.00 21.38 22.74 26.10 28.08 29.38 33.21 35.70 38.14
4,000 11.11 13.59 16.03 17.63 19.22 20.79 22.34 23.88 25.40 29.12 31.31 32.75 36.96 39.68
4,500 12.22 14.97 17.66 19.43 21.17 22.90 24.60 26.29 27.95 32.02 34.39 35.95
5,000 13.30 16.30 19.23 21.16 23.06 24.93 26.78 28.60 30.40 34.78 37.32 38.98
5,500 14.34 17.58 20.76 22.83 24.88 26.89 28.87 30.83 32.74 37.40
Max. power output = (Table output + additional output) x length factor x width factor

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 18
PolyChain® GT Carbon
Power output of the small timing belt pulley
Speed
Number of teeth
of the 22 25 28 30 32 34 36 38 40 45 48 50 56 60 64 75 80
small
pulley
56.02 63.66 71.30 76.39 81.49 86.58 91.67
Pitch diameter
96.77 101.86 114.59 122.23 127.32 142.60 152.79 162.97 190.99 203.72
10 0.11 0.13 0.15 0.17 0.18 0.19 0.21 0.22 0.23 0.26 0.28 0.30 0.34 0.36 0.39 0.46 0.49
20 0.17 0.21 0.24 0.26 0.28 0.31 0.33 0.35 0.37 0.42 0.45 0.48 0.54 0.58 0.62 0.74 0.79
40 0.29 0.34 0.40 0.44 0.48 0.51 0.55 0.59 0.63 0.72 0.77 0.81 0.92 0.99 1.07 1.27 1.36
60 0.39 0.47 0.55 0.61 0.66 0.71 0.76 0.82 0.87 1.00 1.08 1.13 1.28 1.39 1.49 1.77 1.89
100 0.59 0.72 0.84 0.93 1.01 1.09 1.17 1.26 1.34 1.54 1.66 1.74 1.98 2.14 2.30 2.74 2.93
200 1.06 1.29 1.53 1.68 1.83 1.99 2.14 2.29 2.44 2.82 3.05 3.20 3.64 3.94 4.24 5.04 5.41
300 1.50 1.84 2.17 2.40 2.62 2.84 3.06 3.28 3.50 4.05 4.37 4.59 5.23 5.66 6.09 7.25 7.78
400 1.92 2.36 2.80 3.09 3.38 3.67 3.95 4.24 4.53 5.24 5.66 5.94 6.78 7.34 7.89 9.41 10.09
500 2.33 2.87 3.41 3.77 4.12 4.47 4.83 5.18 5.53 6.40 6.92 7.27 8.30 8.98 9.66 11.51 12.35
600 2.73 3.37 4.01 4.43 4.85 5.27 5.68 6.10 6.51 7.54 8.16 8.57 9.78 10.59 11.39 13.59 14.58
700 3.12 3.86 4.59 5.08 5.56 6.05 6.53 7.01 7.48 8.67 9.38 9.85 11.25 12.18 13.11 15.63 16.77
800 3.50 4.34 5.17 5.72 6.27 6.81 7.36 7.90 8.44 9.78 10.58 11.11 12.70 13.75 14.79 17.65 18.93
900 3.88 4.81 5.74 6.35 6.96 7.57 8.18 8.78 9.38 10.88 11.77 12.36 14.13 15.30 16.46 19.64 21.07
1,000 4.25 5.28 6.30 6.98 7.65 8.32 8.99 9.65 10.32 11.96 12.95 13.60 15.54 16.83 18.11 21.61 23.18
1,200 4.98 6.20 7.41 8.21 9.00 9.80 10.59 11.37 12.16 14.10 15.27 16.04 18.33 19.86 21.37 25.49 27.34
1,400 5.69 7.10 8.49 9.41 10.33 11.25 12.16 13.06 13.97 16.21 17.55 18.43 21.08 22.83 24.57 29.30 31.43
1,600 6.39 7.98 9.56 10.60 11.64 12.67 13.70 14.73 15.75 18.28 19.79 20.79 23.78 25.75 27.71 33.04 35.44
1,800 7.08 8.85 10.61 11.77 12.93 14.08 15.22 16.37 17.50 20.32 22.00 23.12 26.44 28.63 30.81 36.72 39.38
2,000 7.75 9.71 11.64 12.92 14.20 15.46 16.73 17.98 19.23 22.34 24.18 25.41 29.06 31.47 33.86 40.34 43.24
2,400 9.07 11.38 13.67 15.18 16.69 18.19 19.68 21.16 22.63 26.29 28.46 29.91 34.19 37.02 39.82 47.39 50.77
2,800 10.36 13.02 15.65 17.39 19.12 20.84 22.56 24.26 25.95 30.15 32.64 34.29 39.19 42.41 45.60 54.20 58.02
3,200 11.61 14.61 17.59 19.55 21.51 23.45 25.38 27.29 29.20 33.92 36.71 38.56 44.05 47.65 51.21 60.76
3,500 12.53 15.79 19.01 21.14 23.26 25.36 27.45 29.53 31.59 36.69 39.70 41.70 47.61 51.48 55.30
4,000 14.03 17.71 21.34 23.74 26.13 28.49 30.84 33.17 35.48 41.19 44.56 46.79 53.36 57.66
4,500 15.49 19.58 23.62 26.28 28.92 31.54 34.14 36.71 39.27 45.56 49.27 51.71
5,000
5,500
16.92
18.31
21.41
23.19
25.84
28.00
28.76
31.17
31.65
34.31
34.51
37.41
37.35
40.48
40.16
43.51
42.95
46.52
49.79
53.87
53.81 56.45
Max. power output = (Table output + additional output) x length factor x width factor
Design information on page 23
Additional power output [kW] for step-down ratio
PolyChain® GT2:
Speed of the
small pulley
1
to
1.04
1.05
to
1.11
1.12
to
1.19
1.2
to
1.3
1.31
to
1.45
1.46
to
1.65
1.66
to
1.99
2
to
2.63
2.64
to
4.47
200 0.00 0.01 0.03 0.04 0.05 0.07 0.08 0.09 0.10
300 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16
400 0.00 0.03 0.05 0.08 0.10 0.13 0.16 0.18 0.21
500 0.00 0.03 0.07 0.10 0.13 0.16 0.20 0.23 0.26
600 0.00 0.04 0.08 0.12 0.16 0.20 0.23 0.27 0.31
700 0.00 0.05 0.09 0.14 0.18 0.23 0.27 0.32 0.36
730 0.00 0.05 0.09 0.14 0.19 0.24 0.28 0.33 0.38
800 0.00 0.05 0.10 0.16 0.21 0.26 0.31 0.36 0.42
900 0.00 0.06 0.12 0.18 0.23 0.29 0.35 0.41 0.47
1,000 0.00 0.06 0.13 0.20 0.26 0.33 0.39 0.46 0.52
1,200 0.00 0.08 0.16 0.23 0.31 0.39 0.47 0.55 0.62
1,400 0.00 0.09 0.18 0.27 0.36 0.46 0.55 0.64 0.73
1,460 0.00 0.09 0.19 0.28 0.38 0.47 0.57 0.66 0.76
1,600 0.00 0.10 0.21 0.31 0.42 0.52 0.62 0.73 0.83
1,800 0.00 0.12 0.23 0.35 0.47 0.59 0.70 0.82 0.94
2,000 0.00 0.13 0.26 0.39 0.52 0.65 0.78 0.91 1.04
2,400 0.00 0.16 0.31 0.47 0.62 0.78 0.94 1.09 1.25
2,800 0.00 0.18 0.36 0.55 0.73 0.91 1.09 1.27 1.46
2,880 0.00 0.19 0.37 0.56 0.75 0.94 1.12 1.31 1.50
3,200 0.00 0.21 0.42 0.62 0.83 1.04 1.25 1.46 1.66
3,500 0.00 0.23 0.46 0.68 0.91 1.14 1.37 1.59 1.82
4,000 0.00 0.26 0.52 0.78 1.04 1.30 1.56 1.82 2.08
4,500 0.00 0.29 0.59 0.88 1.17 1.46 1.76 2.05 2.34
5,000 0.00 0.32 0.65 0.98 1.30 1.63 1.95 2.28 2.60
5,500 0.00 0.36 0.72 1.07 1.43 1.79 2.15 2.50 2.86
Additional power output [kW] for step-down ratio
PolyChain® Carbon TM:
Speed of the
small pulley
1.00 1.02 1.05 1.10 1.15 1.21 1.30 1.43 1.64 2.15
1.02 1.05 1.10 1.15 1.21 1.30 1.43 1.64 2.15
and
over
20 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01
40 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.02 0.02 0.02
60 0.00 0.00 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03
100 0.00 0.01 0.01 0.02 0.02 0.03 0.04 0.04 0.05 0.05
200 0.00 0.01 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11
300 0.00 0.02 0.04 0.05 0.07 0.09 0.11 0.12 0.14 0.16
400 0.00 0.02 0.05 0.07 0.09 0.12 0.14 0.17 0.19 0.21
500 0.00 0.03 0.06 0.09 0.12 0.15 0.18 0.21 0.24 0.27
600 0.00 0.04 0.07 0.11 0.14 0.18 0.21 0.25 0.28 0.32
700 0.00 0.04 0.08 0.12 0.17 0.21 0.25 0.29 0.33 0.37
800 0.00 0.05 0.09 0.14 0.19 0.24 0.28 0.33 0.38 0.43
900 0.00 0.05 0.11 0.16 0.21 0.27 0.32 0.37 0.43 0.48
1,000 0.00 0.06 0.12 0.18 0.24 0.30 0.36 0.42 0.47 0.53
1,200 0.00 0.07 0.14 0.21 0.28 0.36 0.43 0.50 0.57 0.64
1,400 0.00 0.08 0.17 0.25 0.33 0.42 0.50 0.58 0.66 0.75
1,600 0.00 0.10 0.19 0.29 0.38 0.47 0.57 0.66 0.76 0.85
1,800 0.00 0.11 0.21 0.32 0.43 0.53 0.64 0.75 0.85 0.96
2,000 0.00 0.12 0.24 0.36 0.47 0.59 0.71 0.83 0.95 1.07
2,400 0.00 0.14 0.28 0.43 0.57 0.71 0.85 1.00 1.14 1.28
2,800 0.00 0.17 0.33 0.50 0.66 0.83 1.00 1.16 1.33 1.50
3,200 0.00 0.19 0.38 0.57 0.76 0.95 1.14 1.33 1.52 1.71
3,500 0.00 0.21 0.41 0.62 0.83 1.04 1.25 1.45 1.66 1.87
4,000 0.00 0.24 0.47 0.71 0.95 1.19 1.42 1.66 1.90 2.14
4,500 0.00 0.27 0.53 0.80 1.07 1.34 1.60 1.87 2.14 2.40
5,000 0.00 0.30 0.59 0.89 1.19 1.48 1.78 2.08 2.37 2.67
5,500 0.00 0.33 0.65 0.98 1.30 1.63 1.96 2.28 2.61 2.94

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 19
Standard lengths and length correction
factors S 6
Standard widths 12, 21, 36, 62 mm
Pitch length
(mm)
Length
correction
factor
Number
of teeth
640 0.79 80
720 0.83 90
800 0.87 100
896 0.91 112
960 0.94 120
1,000 0.96 125
1,040 0.97 130
1,120 1.00 140
1,200 1.03 150
1,224 1.03 153
1,280 1.05 160
1,440 1.10 180
1,600 1.14 200
1,760 1.17 220
1,792 1.18 224
2,000 1.22 250
2,200 1.26 275
2,240 1.26 280
2,400 1.29 300
2,520 1.31 315
2,600 1.32 325
2,800 1.35 350
2,840 1.36 355
3,048 1.38 381
3,200 1.40 400
3,600 1.45 450
4,000 1.49 500
4,400 1.52 550
4,480 1.53 560
Width factor S 7
Belt width 12 21 36 62
Width factor 1 1.75 3.00 5.17
Timing belts in custom lengths*
Number
of teeth
Length
(mm)
Number
of teeth
Length
(mm)
31 248 57 456
36 288 60 480
44 352 68 544
52 416 76 608
* Length correction factors and permissible power output data
available on request; may necessitate longer delivery times and
minimum purchase quantities.
Timing belt pulley diameter
Number
of teeth
Pitch ø
(mm)
Outer ø
(mm)
22 56.02 54.42
23 58.57 56.97
24 61.12 59.52
25 63.66 62.06
26 66.21 64.61
27 68.75 67.15
28 71.30 69.70
29 73.85 72.25
30 76.39 74.79
31 78.94 77.34
32 81.49 79.89
33 84.03 82.43
34 86.58 84.98
35 89.13 87.53
36 91.67 90.07
37 94.22 92.62
38 96.77 95.17
39 99.31 97.71
40 101.86 100.26
41 104.41 102.81
42 106.95 105.35
43 109.50 107.90
44 112.05 110.44
45 114.59 112.99
46 117.14 115.54
47 119.68 118.08
48 122.23 120.63
49 124.78 123.18
50 127.32 125.72
51 129.87 128.27
52 132.42 130.82
53 134.96 133.36
54 137.51 135.91
55 140.06 138.46
56 142.60 141.00
57 145.15 143.55
58 147.70 146.10
59 150.24 148.64
60 152.79 151.19
61 155.33 153.74
62 157.88 156.28
63 160.43 158.83
64 162.97 161.37
65 165.52 163.92
66 168.07 166.47
67 170.61 169.01
68 173.16 171.56
69 175.71 174.11
70 178.25 176.65
71 180.80 179.20
Number
of teeth
Pitch ø
(mm)
Outer ø
(mm)
72 183.35 181.75
73 185.89 184.29
74 188.44 186.84
75 190.99 189.39
76 193.53 191.93
77 196.08 194.48
78 198.62 197.03
79 201.17 199.57
80 203.72 202.12
81 206.26 204.66
82 208.81 207.21
83 211.36 209.76
84 213.90 212.30
85 216.45 214.85
86 219.00 217.40
87 221.54 219.94
88 224.09 222.49
89 226.64 225.04
90 229.18 227.58
91 231.73 230.13
92 234.28 232.68
93 236.82 235.22
94 239.37 237.77
95 241.92 240.32
96 244.46 242.86
97 247.01 245.41
98 249.55 247.95
99 252.10 250.50
100 254.65 253.05
101 257.19 255.59
102 259.74 258.14
103 262.29 260.69
104 264.83 263.23
105 267.38 265.78
106 269.93 268.33
107 272.47 270.87
108 275.02 273.42
109 277.57 275.97
110 280.11 278.51
111 282.66 281.06
112 285.21 283.61
113 287.75 286.15
114 290.30 288.70
115 292.85 291.24
116 295.39 293.79
117 297.94 296.36
118 300.48 298.88
119 303.03 301.43
120 305.58 303.98

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 20
Timing belt pitch PC – 14MGT and PC – 14MGT Carbon
Calculation of the dimensions and design of belt drive units can be
based on the motor side (motor power output) and on the load
side (load collectives). Both calculations – depending on the existing
safety factors, desired service life or any load-side efficiency
losses – can result in designs for drive systems with different over-
Maximum permissible tangential loads
The values listed in the following tables represent the operationally
useable tangential loads. The listed values apply to quasistatic
loads, i.e. for low speed ranges (n ≤ 100 rpm) with the use of
timing belt pulleys with at least 34 teeth.
PolyChain® GT2
Belt width (mm) 37 68 90 125
Fzul (N) 11289 20747 27460 38138
Power output in kW / 20 mm belt width
Note: The following power output data was obtained in extensive
series of tests on the basis of defined service life values and
includes safety factors that were defined internally beforehand
to achieve the corresponding service life. Therefore, the power
Poly Chain® GT2
Speed of the
small pulley
Max. power output = (Table output + additional output) x length factor x width factor
Design information on page 23
all widths. In addition to the load value calculation, therefore,
we also recommend that you use the following power output
table to compare the actual tangential loads with the maximum
permissible loads.
The initial tensions for mounting of the belts are already included
in the power output values and do not have to be subtracted from
the listed values.
PolyChain® GT Carbon
Belt width (mm) 37 68 90 125
Fzul (N) 13829 25416 33639 46720
output data cannot be compared directly with data of other
manufacturers; if you have any questions, please contact our
application engineers.
Power output of the small timing belt pulley
Number of teeth
28 30 32 34 36 38 40 44 48 50 56 60 64
Pitch diameter
124.78 133.69 142.60 151.52 160.43 169.34 178.25 196.08 213.90 222.82 249.55 267.38 285.21
10 0.72 0.77 0.83 0.89 0.95 1.00 1.06 1.17 1.29 1.34 1.51 1.62 1.73
20 1.10 1.19 1.29 1.38 1.47 1.56 1.65 1.83 2.01 2.10 2.36 2.54 2.71
40 1.80 1.95 2.10 2.26 2.41 2.56 2.71 3.02 3.32 3.46 3.91 4.20 4.50
80 3.05 3.32 3.59 3.86 4.13 4.39 4.66 5.18 5.71 5.97 6.74 7.25 7.76
100 3.64 3.97 4.30 4.62 4.94 5.26 5.58 6.21 6.84 7.15 8.08 8.70 9.31
200 6.40 6.99 7.57 8.16 8.74 9.31 9.88 11.02 12.15 12.71 14.38 15.49 16.58
300 8.95 9.78 10.62 11.44 12.26 13.08 13.89 15.51 17.11 17.90 20.26 21.83 23.38
400 11.36 12.44 13.50 14.56 15.62 16.67 17.71 19.78 21.83 22.85 25.87 27.87 29.86
500 13.68 14.98 16.28 17.57 18.85 20.12 21.39 23.90 26.38 27.61 31.28 33.70 36.10
600 15.92 17.45 18.97 20.48 21.98 23.47 24.95 27.89 30.79 32.24 36.53 39.35 42.16
700 18.09 19.84 21.58 23.30 25.02 26.72 28.41 31.77 35.09 36.74 41.63 44.86 48.05
730 18.73 20.55 22.35 24.14 25.92 27.68 29.44 32.92 36.36 38.07 43.14 46.48 49.79
800 20.21 22.17 24.12 26.06 27.99 29.90 31.80 35.56 39.29 41.13 46.61 50.22 53.80
900 22.27 24.45 26.61 28.76 30.89 33.01 35.11 39.27 43.39 45.43 51.48 55.46 59.41
1,000 24.30 26.68 29.05 31.40 33.73 36.05 38.35 42.91 47.41 49.64 56.25 60.60 64.90
1,200 28.23 31.02 33.79 36.54 39.26 41.97 44.66 49.97 55.22 57.81 65.50 70.54 75.52
1,400 32.02 35.21 38.37 41.50 44.61 47.69 50.75 56.79 62.74 65.69 74.39 80.09 85.71
1,460 33.13 36.43 39.71 42.96 46.18 49.37 52.53 58.79 64.95 68.00 77.00 82.88 88.69
1,600 35.68 39.26 42.80 46.30 49.78 53.22 56.64 63.38 70.01 73.29 82.96 89.27 95.48
1,800 39.24 43.19 47.10 50.97 54.80 58.59 62.35 69.76 77.04 80.63 91.20 98.08 104.83
2,000 42.70 47.01 51.27 55.49 59.67 63.80 67.89 75.94 83.83 87.71 99.12 106.52 113.76
2,400 49.33 54.33 59.28 64.16 68.98 73.75 78.45 87.69 96.70 101.11 114.00
2,800 55.60 61.26 66.84 72.35 77.77 83.11 88.37 98.66 108.63 113.49
2,880 56.82 62.61 68.31 73.93 79.46 84.91 90.28 100.76 110.90
3,200 61.55 67.82 73.99 80.06 86.02 91.88 97.64 108.83
3,500 65.79 72.50 79.08 85.54 91.87 98.08 104.16
4,000 72.48 79.84 87.04 94.08 100.95

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 21
Poly Chain® Carbon
Power output of the small timing belt pulley
Speed of the
small pulley 28 30 32 34 36 38 40
Number of teeth
44 48
Pitch diameter
50 56 60 64 72 75 80
124.78 133.69 142.60 151.52 160.43 169.34 178.25 196.08 213.90 222.82 249.55 267.38 285.21 320.86 334.23 356.51
10 0.88 0.94 1.01 1.08 1.15 1.22 1.29 1.42 1.56 1.62 1.82 1.96 2.09 2.35 2.45 2.62
20 1.37 1.48 1.59 1.70 1.81 1.92 2.03 2.25 2.46 2.57 2.89 3.10 3.32 3.74 3.89 4.16
40 2.28 2.47 2.65 2.84 3.03 3.21 3.40 3.76 4.13 4.31 4.85 5.21 5.56 6.27 6.54 6.98
60 3.13 3.39 3.65 3.91 4.17 4.42 4.68 5.19 5.69 5.94 6.69 7.19 7.68 8.66 9.03 9.63
100 4.73 5.13 5.53 5.93 6.32 6.72 7.11 7.88 8.66 9.04 10.19 10.94 11.70 13.20 13.75 14.68
200 8.45 9.18 9.90 10.62 11.34 12.05 12.76 14.17 15.57 16.26 18.34 19.71 21.07 23.77 24.78 26.44
300 11.93 12.97 14.00 15.02 16.04 17.06 18.07 20.08 22.07 23.06 26.00 27.95 29.89 33.72 35.15 37.52
400 15.26 16.59 17.92 19.24 20.56 21.86 23.16 25.75 28.31 29.58 33.36 35.87 38.35 43.27 45.10 48.14
500 18.47 20.10 21.72 23.32 24.92 26.51 28.09 31.23 34.35 35.89 40.49 43.53 46.55 52.52 54.74 58.41
600 21.59 23.51 25.41 27.29 29.17 31.04 32.89 36.58 40.23 42.04 47.43 50.99 54.52 61.51 64.10 68.40
700 24.65 26.84 29.01 31.17 33.32 35.46 37.59 41.80 45.98 48.05 54.21 58.28 62.31 70.28 73.24 78.14
800 27.63 30.10 32.54 34.98 37.39 39.79 42.18 46.92 51.61 53.94 60.85 65.41 69.93 78.86 82.17 87.65
900 30.56 33.30 36.01 38.71 41.39 44.05 46.70 51.94 57.14 59.71 67.36 72.40 77.40 87.26 90.91 96.95
1,000 33.44 36.44 39.42 42.37 45.31 48.23 51.13 56.88 62.57 65.39 73.76 79.27 84.73 95.49 99.47 106.05
1,200 39.06 42.58 46.07 49.54 52.98 56.40 59.80 66.52 73.17 76.46 86.22 92.64 98.98 111.46 116.07 123.67
1,400 44.53 48.55 52.55 56.51 60.44 64.34 68.22 75.88 83.45 87.19 98.28 105.55 112.73 126.82 132.01 140.55
1,600 49.85 54.37 58.85 63.29 67.70 72.07 76.41 84.98 93.43 97.61 109.96 118.04 126.00 141.58 147.30 156.68
1,800 55.05 60.05 65.01 69.92 74.78 79.61 84.39 93.84 103.13 107.72 121.27 130.11 138.80 155.73
2,000 60.13 65.60 71.02 76.38 81.70 86.96 92.18 102.46 112.57 117.55 132.21 141.76 151.12
2,400 69.97 76.35 82.65 88.88 95.05 101.14 107.17 119.03 130.62 136.32 153.00
2,800 79.41 86.64 93.78 100.83 107.78 114.65 121.42 134.70 147.61 153.92
3,200 88.47 96.51 104.43 112.23 119.92 127.48 134.93 149.45
3,500 95.02 103.64 112.11 120.43 128.62 136.66 144.56
4,000 105.49 114.99 124.30 133.43 142.36 151.10
Max. power output = (Table output + additional output) x length factor x width factor
Design information on page 23
Additional power output [kW] for step-down ratio
Poly Chain® GT2
Speed of
the small
pulley
1
to
1.04
1.05
to
1.11
1.12
to
1.19
1.2
to
1.3
1.31
to
1.45
1.46
to
1.65
1.66
to
1.99
2
to
2.63
2.64
to
4.47
200 0.00 0.07 0.15 0.22 0.29 0.37 0.44 0.51 0.59
300 0.00 0.11 0.22 0.33 0.44 0.55 0.66 0.77 0.88
400 0.00 0.15 0.29 0.44 0.59 0.74 0.88 1.03 1.18
500 0.00 0.18 0.37 0.55 0.74 0.92 1.10 1.29 1.47
600 0.00 0.22 0.44 0.66 0.88 1.10 1.32 1.54 1.76
700 0.00 0.26 0.52 0.77 1.03 1.29 1.54 1.80 2.06
730 0.00 0.27 0.54 0.81 1.07 1.34 1.61 1.88 2.15
800 0.00 0.29 0.59 0.88 1.18 1.47 1.77 2.06 2.35
900 0.00 0.33 0.66 0.99 1.32 1.65 1.99 2.32 2.65
1,000 0.00 0.37 0.74 1.10 1.47 1.84 2.21 2.57 2.94
1,200 0.00 0.44 0.88 1.32 1.76 2.21 2.65 3.09 3.53
1,400 0.00 0.51 1.03 1.54 2.06 2.57 3.09 3.60 4.12
1,460 0.00 0.54 1.07 1.61 2.15 2.68 3.22 3.76 4.29
1,600 0.00 0.59 1.18 1.77 2.35 2.94 3.53 4.12 4.71
1,800 0.00 0.66 1.32 1.99 2.65 3.31 3.97 4.63 5.29
2,000 0.00 0.74 1.47 2.21 2.94 3.68 4.41 5.15 5.88
2,400 0.00 0.88 1.77 2.65 3.53 4.41 5.30 6.18 7.06
2,800 0.00 1.03 2.06 3.09 4.12 5.15 6.18 7.21 8.24
2,880 0.00 1.06 2.12 3.18 4.24 5.30 6.35 7.41 8.47
3,200 0.00 1.18 2.36 3.53 4.71 5.88 7.06 8.24 9.41
3,500 0.00 1.29 2.58 3.86 5.15 6.44 7.72 9.01 10.30
4,000 0.00 1.47 2.94 4.41 5.88 7.35 8.83 10.30 11.77
Additional power output [kW] for step-down ratio
Poly Chain® Carbon TM
Speed of
the small
pulley
1
to
1.03
1.03
to
1.10
1.10
to
1.19
1.19
to
1.30
1.30
to
1.45
1.45
to
1.67
1.67
to
2.02
2.02
to
2.69
2.69
to
4.64
4.64
and
above
20 0.00 0.01 0.02 0.02 0.03 0.04 0.05 0.05 0.06 0.07
40 0.00 0.02 0.03 0.05 0.06 0.08 0.09 0.11 0.12 0.14
60 0.00 0.02 0.05 0.07 0.09 0.11 0.14 0.16 0.18 0.20
100 0.00 0.04 0.08 0.11 0.15 0.19 0.23 0.26 0.30 0.34
200 0.00 0.08 0.15 0.23 0.30 0.38 0.45 0.53 0.61 0.68
300 0.00 0.11 0.23 0.34 0.45 0.57 0.68 0.79 0.91 1.02
400 0.00 0.15 0.30 0.45 0.61 0.76 0.91 1.06 1.21 1.36
500 0.00 0.19 0.38 0.57 0.76 0.95 1.13 1.32 1.51 1.70
600 0.00 0.23 0.45 0.68 0.91 1.14 1.36 1.59 1.82 2.04
700 0.00 0.27 0.53 0.79 1.06 1.32 1.59 1.85 2.12 2.38
800 0.00 0.30 0.61 0.91 1.21 1.51 1.82 2.12 2.42 2.72
900 0.00 0.34 0.68 1.02 1.36 1.70 2.04 2.38 2.72 3.06
1,000 0.00 0.38 0.76 1.13 1.51 1.89 2.27 2.65 3.03 3.41
1,200 0.00 0.45 0.91 1.36 1.82 2.27 2.72 3.18 3.63 4.09
1,400 0.00 0.53 1.06 1.59 2.12 2.65 3.18 3.71 4.24 4.77
1,600 0.00 0.61 1.21 1.82 2.42 3.03 3.63 4.24 4.84 5.45
1,800 0.00 0.68 1.36 2.04 2.72 3.41 4.09 4.77 5.45 6.13
2,000 0.00 0.76 1.51 2.27 3.03 3.78 4.54 5.30 6.05 6.81
2,400 0.00 0.91 1.82 2.72 3.63 4.54 5.45 6.36 7.26 8.17
2,800 0.00 1.06 2.12 3.18 4.24 5.30 6.36 7.42 8.48 9.53
3,200 0.00 1.21 2.42 3.63 4.84 6.06 7.26 8.48 9.69 10.90
3,500 0.00 1.33 2.65 3.97 5.30 6.62 7.94 9.27 10.59 11.92
4,000 0.00 1.51 3.03 4.54 6.06 7.57 9.08 10.59 12.11 13.62

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 22
Standard lengths and length correction factors S 6
Standard widths 37, 68, 90, 125 mm
Pitch length (mm) Length correction factor Number of teeth
994 0.68 71
1,120 0.73 80
1,190 0.75 85
1,260 0.77 90
1,400 0.81 100
1,568 0.85 112
1,610 0.86 115
1,750 0.89 125
1,890 0.92 133
1,960 0.94 140
2,100 0.96 150
2,240 0.99 160
2,310 1.00 165
2,380 1.01 170
2,450 1.02 175
2,520 1.03 180
2,590 1.04 185
2,660 1.05 190
2,800 1.07 200
3,136 1.12 224
3,304 1.14 236
3,360 1.14 240
3,500 1.16 250
3,850
1.19 275
3,920 1.20 280
4,326 1.24 309
4,410 1.25 315
Custom widths available on request.
Width factor S 7
Belt width 37 68 90 125
Width factor 1.85 3.40 4.50 6.25
Timing belt pulley diameter
Number Pitch ø Outer ø
of teeth (mm) (mm)
28 124.78 121.98
29 129.23 126.43
30 133.69 130.89
31 138.15 135.35
32 142.60 139.80
33 147.06 144.26
34 151.52 148.72
35 155.97 153.17
36 160.43 157.63
37 164.88 162.09
38 169.34 166.54
39 173.80 171.00
40 178.25 175.45
41 182.71 179.91
42 187.17 184.37
43 191.62 188.82
44 196.08 193.28
45 200.54 197.74
46 204.99 202.19
47 209.45 206.65
48 213.90 211.11
49 218.36 215.56
50 222.82 220.02
51 227.27 224.47
52 231.73 228.93
53 236.19 233.39
54 240.64 237.84
55 245.10 242.30
56 249.55 246.76
57 254.01 251.21
58 258.47 255.67
59 262.92 260.12
60 267.38 264.58
61 271.84 269.04
62 276.29 273.49
63 280.75 277.95
64 285.21 282.41
65 289.66 286.86
66 294.12 291.32
67 298.57 295.78
68 303.03 300.23
69 307.49 304.69
70 311.94 309.14
71 316.40 313.60
72 320.86 318.06
73 325.31 322.51
74 329.97 326.97
Number Pitch ø Outer ø
of teeth (mm) (mm)
75 334.23 331.43
76 338.68 335.88
77 343.14 340.34
78 347.59 344.80
79 352.05 349.25
80 356.51 353.71
81 360.96 358.16
82 365.42 362.62
83 369.88 367.08
84 374.33 371.53
85 378.79 375.99
86 383.25 380.45
87 387.70 384.90
88 392.16 389.36
89 396.61 393.82
90 401.07 398.27
91 405.53 402.73
92 409.98 407.18
93 414.44 411.64
94 418.90 416.10
95 423.35 420.55
96 427.81 425.01
97 432.26 429.47
98 436.72 433.92
99 441.17 438.37
100 445.63 442.83
101 450.09 447.29
102 454.55 451.75
103 459.00 456.20
104 463.46 460.66
105 467.92 465.12
106 472.37 469.57
107 476.83 474.03
108 481.28 478.49
109 485.74 482.94
110 490.20 487.40
111 494.65 491.85
112 499.11 496.31
113 503.57 500.77
114 508.02 505.22
115 512.48 509.68
116 516.94 514.14
117 521.39 518.59
118 525.85 523.05
119 530.30 527.51
120 534.76 531.96

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 23
Calculation & formulas
Calculation
General
The basis for determining the timing belt dimensions is a calculation
method that takes the following influences into account:
* Power
* Torques
* Speed
* Duty cycle of the drive system
* Operating characteristics
* Number of meshing teeth
* Transmission ratio
* Centre distance of axes
All data concerning the transmitted torque, the speed and the
length of a PolyChain® timing belt relates to the pitch line, which
is assumed to be centre of the tensile member. The pitch line is
precisely defined and is identical to the pitch diameter on the timing
belt pulley. Half the difference in diameter between the pitch
diameter and outer diameter is equal to the size of the belt tooth
root to the centre of the tensile body.
Project data sheet
During the design and the later dimensioning of a drive system,
you should remember that optimum use of the transmission
capacity, long service life and high efficiency are possible only if
the actual operating conditions are known, so that critical conditions
can already be taken into account during the design stage.
The project data sheet on page 44 is provided to help you with
this task.
Preliminary selection
Use the diagram on page 5 to make a preliminary selection of the
suitable belt pitch.
Belt width
Taking into account the inherent load of the timing belt, it is
always a good idea to select a belt width that is smaller than the
diameter of the smallest timing belt pulley. A wider timing belt, if
mounted incorrectly, is more likely to cause varying edge tensions,
which can prevent optimum running of the belt. In borderline
cases, it is often better to select a larger pitch instead of a wider
belt. If this is not possible, we recommend a belt pitch in 2 parallel
running belt segments (of the same length), to reduce the
transverse rigidity of the belt in combination with the small pulley
diameters.
Pulley diameter
Use pulleys with the largest diameters possible! This makes optimal
use of the power output range of the belt at high peripheral
speeds. Pulleys with larger diameters have less bending stress and
the belt does not have to be as wide.
Safety factors
The table on page 25 shows load factors that include the drive
characteristics of various machine types as an increased safety
factor.
In addition to these safety factors, it can be extremely important
to include starting and stopping processes together with the corresponding
mass effects of the respective drive system as a design
criterion for the safety considerations. Especially during stopping
or locking processes, mass effect can cause inertia forces that are
far above the maximum permissible tangential loads of the belts
listed in the power output tables (pages 17 and 20).
The use of suitable regulators (e.g. a soft start ramp controller for
starting and stopping) or the use of suitable overload protection
can greatly reduce the mass effect to optimize fail-safe operation.
Abbreviations
a
a
A
b
b R
B
B W
C spez
d B
d a
d w
d wk
d wg
e
F a
F b
F B
F H
F P
F R
F t
F U
F V
F zul
g
h S
h t
i
l w
l t
M
m
m L
m R
m ges
m Z
m Z, red
n
n MOT
P
P B
P N
S Bruch
S G
S 1
S 2
S 3
S 4
S 5
S 6
S 7
t
v
z
z e
z g
z k
Temperature expansion coefficient
Acceleration
Centre distance of axes
Braking deceleration
Belt width
Pulley width
Flexural fatigue
Specific spring constant
Bore diameter
Outer diameter
Pitch diameter
Pitch diameter of small pulley
Pitch diameter of large pulley
Stretching
Acceleration force
Braking force
Driving force, calculated
Lifting force
Test load for belt tension
Friction force
Span tension
Tangential load
Initial tension
Maximum permissible tangential load
Acceleration of gravity
Belt thickness
Tooth height
Transmission ratio
Pitch length
Taut side
Torque
Mass
Mass of load
Mass of belt
Total weight
Mass of timing belt pulley
Reduced mass of timing belt pulley
Speed
Motor speed
Power output
Calculated power output
Rated power output
Security against fracture
Total application factor
Load factor
Tooth mesh factor
Transmission allowance
Bending factor
Special application factor
Belt length factor
Belt width factor
Pitch
Speed
Number of belt pulleys
Number of meshing teeth
Number of teeth, large pulley
Number of teeth, small pulley
1/K
m/s 2
mm
m/s 2
mm
mm
1/s
N
mm
mm
mm
mm
mm
%
N
N
N
N
N
N
N
N
N
N
m/s 2
mm
mm
mm
mm
Nm
kg
kg
kg
kg
kg
kg
l/min
l/min
kW
kW
kW
m/s
(The formula collection applies to all timing belt catalogs;
therefore, it is possible that not all abbreviations occur in
this catalog).

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 24
Formulas
Torque
M = P · 9.55 · 103 = F U · d W [Nm]
n 2 · 10 3
Power output
P = M · n = F U · v [kW]
9.55 · 103 10 3
Tangential load
F U = P · 103 = M · 2 · 10 3 [N]
v d w
Speed
n = 19.1 · 103 · v [min -1 ]
d w
Peripheral speed
v = d w · n m
19.1 · 103 s
Acceleration force
F a = m · a [N]
Braking force
F b = m · b [N]
n, v
Lifting force
F H = m · g [N]
Friction force
F R = m · g · µ [N]
Mass
n, v = const.
m = m L + m R + m Zred [kg]
with m R = I W · m G
Reduced mass of timing belt pulley
mZred = mZ · ( 1 + dB 2
) [kg]
2 da
2
Mass of timing belt pulley
mZ = (d 2 –
a d 2) · p · B · V
B [kg]
4 · 106
V = density
Stretching
e = DI · 100 [%]
It
Flexural fatigue
B w = v · z · 103 [1/s]
I w
v = d0 . π . n = d0 . n
60 19,1
startup braking
t a = v
a
sa = v2
2 . a
t = s
v
s = v . t
t ges = t a + t + t b
s ges = s a + s + s b
Motion equations for acceleration and stopping processes
t, s
t a
S a
t b
S b
: startup time
: startup path
: braking time
: braking path

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 25
Load factor S 1
The load factor S 1 is found in the intersecting point of the
previously classified driven machine (row) and in the machine
Driven machines Drive
For machines not listed, select a safety factor that most nearly
corresponds to one of the listed groups.
Class The different types of driven machines
1
2
3
4
5
6
filling systems, measuring devices, medical
instruments
floor cleaning equipment, sewing machines,
office machines, light-duty woodworking
machines, band saws, drills and lathes
conveyor systems for small packages, wood slats,
presses, lathes, washing machines, heavy-duty
woodworking machines, sawing machines
stirring machines for viscous liquids, dough
mixers, conveyor belts: coal, sand, ore, shaft
drives, drills, lathes, screwdrivers, peeling
machines, grinding machines, circular saws,
planing machines, paper machines (except
masticators) pressing-embossing machines,
shears, printing presses, centrifugal pumps and
compressors, vibration machines
tile-moulding machines, conveyor belts, fans,
generators, centrifugal blowers, elevators / lifting
gear, extruders
brick and clay machines, conveyor systems:
flat and bucket lifts/worm screws, centrifuges,
hammer mills, paper machines, textile machines
class of the driven machine in question, taking into account the
duty cycle (column).
AC and three-phase motors, normal
starting torque, e.g. with short circuit
rotor motors, compound DC motors,
internal combustion engines with more
than 4 cylinders
short-term
operation
3 – 8 hours
daily
normal
operation
8 – 16 hours
daily
continuous
operation
16 – 24 hours
daily
AC and three-phase motors, high
starting torque, e.g. single-phase and
synchronous motors, three-phase
braking motors, hydraulic motors,
internal combustion engines with up to
4 cylinders
short-term
operation
3 – 8 hours
daily
normal
operation
8 – 16 hours
daily
continuous
operation
16 – 24 hours
daily
1.0 1.2 1.4 1.2 1.4 1.6
1.1 1.3 1.5 1.3 1.5 1.7
1.2 1.4 1.6 1.6 1.8 2.0
1.3 1.5 1.7 1.6 1.8 2.0
1.4 1.6 1.8 1.8 2.0 2.2
1.5 1.7 1.9 1.9 2.1 2.3
7 pulverising machines, ventilators for mines 1.6 1.8 2.0 2.0 2.2 2.4
8
piston compressors, mills: ball mill, rubble mill
and sawmill equipment, piston pumps
1.7 1.9 2.1 2.1 2.3 2.5
The listed safety factors can be used as reference values for numerous applications, but they cannot replace a detailed technical assessment
of the particular application.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 26
Calculation method
To select a suitable PolyChain® GT2 timing belt drive system, you
need the following data:
1. Power output and type of drive machine and driven machine
2. Operation time
3. Speed of drive machine and driven machine
4. Centre distance of axes of the drive system
Step 1:
Determine the calculated power output
A. To determine the calculated power output, firs you have to define
the load factor S 1 of the drive from the table on page 25.
B. Multiply this load factor times the input power. The result is the
calculated power output required for defining the belt drive.
P B = P N · S 1
Step 2:
Select the timing belt pitch
A. Enter the calculated power output in the “Selection diagram for
belt pitch” (page 5) on the horizontal axis. Use the speed of the
faster shaft (or of the small timing belt pulley) for the vertical
axis.
B. The timing belt belt pitch for further calculations can be found
at the point where the two factors intersect. If the point of
intersection is near the separation between 8 mm and 14 mm
pitch, it is recommended to calculate the drive system for both
pitches and to use the drive system that is best suited for your
application.
Step 3:
Select the timing belt width
For all transmission and reduction drive systems
A. The power output tables on pages 17 and 20 contain the values
for the smallest standard belt width. A different width factor has
to be used for larger belt widths. The column on the left side of
the power output table contains the speed of the small timing
belt pulley; the line above the table contains the number of
teeth of the timing belt pulley and its pitch diameter. The power
output of the timing belt can be found at the point where the
pulley speed and the number of pulley teeth intersect.
B. Select a belt width and determine the corresponding power
output. Multiply this power output value times the timing belt
length correction factor S 6 , which can be found in the table under
the power output table* to determine the corrected power
output.
P KORR = P TAB, S.17ff. · S 6 · S 7
* Factors S 6 and S 7 are explained on pages 19 and 22.
If the corrected power output is equal to or greater than the calculated
power output, this belt width can be used. If not, repeat this
step with the next larger timing belt width. If the largest belt width
does not produce satisfactory results, you should use a larger timing
belt pulley or, if possible, a larger pitch.
P KORR > P B · S 2
Note:
Depending on the degree of acceleration and braking torque and
the frequency of reversal of motion, the timing belt pulley diameter
should be as large as possible with a minimum of 12 meshing teeth.
If the number of meshing teeth is less than 6, this has to be compensated
for with the correction factor S 2 in the drive calculation.
Tooth mesh factor S 2
Number of meshing teeth 5 4 3 2
S2 1.25 1.66 2.5 5.0
Number of meshing teeth Ze on the small pulley:
Ze = Z k [
3 – d wg – d wk ]
6 A
C. If the calculation results in several possible combinations
of timing belt pulleys, you should observe the following
principles:
a. A larger timing belt pulley diameter requires a smaller timing
belt width.
b. The belt width should not be greater than the diameter
of the smallest timing belt pulley.
c. Large timing belt pulley diameters reduce wear on the bearings
and shaft.
Step 4:
Installation and belt tension
Due to the low stretching tendency of the tensile member,
PolyChain® GT2 belts generally require no re-tightening. Adjustments
must be made during installation of the belts to compensate
for production tolerances and to set a specified initial tension.
The recommended radial settings of the centre distance of axes
are listed on page 14.
Step 5:
Calculation of initial belt tension
The initial required tension is calculated based on the equations
on page 13.
Step 6:
Select the drive components
Based on the calculated drive system data and geometries, you can
select a suitable drive component combination from the standard
line of pulleys. In special cases, it may be necessary to manufacture
custom pulleys according to your drawing specifications.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 27
Sample calculation
Drive data
Drive:
Three-phase motor, high starting torque P = 5 kW at
n 1 = 1750 min-1
Duty cycle 6 hours daily
Step-up ratio
Step 1:
Determine the calculated power output P B
Output:
Woodworking machine, n 2 = 2150 min-1
Centre distance of axes ca. 430 mm.
Calculation steps Results
A. Type of drive machine: You will find the drive motor used in the third class
in the table on page 15.
B. Load factor from table (woodworking machines): 1,6.
C. Calculated power output = Load factor x drive power
P B = S 1 x P N
Step 2:
Select the pitch
From the “Selection diagram for belt pitch” on page 5
you see that: at 8 kW and 2150 min -1 a pitch of 8 mm is recommended.
Select the combination of timing belt pulleys, timing belt length,
Calculate the centre distance of axes:
1. Calculation of the transmission ratio
i = 2150 = 1.23
1750
2. Select the number of pulley teeth
based on the required transmission i
e.g. z 1 = 34; z 2 = 28 i = 1.214
3. Select the timing belt length analogous to the existing pitch lengths of the
pitch 8M
e.g. I w = 1120 mm
4. Calculate the centre distance of axes with the corresponding factors
(Separate formula collection, to be provided on request)
A = 435.93 mm
Step 3:
Select the belt width
In the power output table on page 17, for a timing belt pulley with 28 teeth
at a speed of 2,150 min -1 a power output of P TAB, z 1 = P TAB · S 6 · S 7 = 14,8 kW
is specified for a belt width of 21 mm. This power output is higher than
the calculated power output P B = 8 kW, multiplied by the tooth mesh
factor (S 2 = 1)
Step 4:
Installation and mounting data
According to the tables on page 14, the minimum travel of a shaft to the initial
belt tension is –2.8 mm/+0.8 mm.
Step 5:
Calculation of initial belt tension
Use the equation on page 15.
Load factor S 1 = 1.6
Calculated power output = 1.6 x 5 = 8 kW
Belt pitch = 8 mm
i = 1.23
selected:
z 1 8M - 34 S
z 2 8M - 28 S
selected:
Timing belt length = 1120 mm
Centre distance of axes: 435.93 mm
Belt width b = 21 mm
Minimum travel to belt tension:
–2.8 mm / +0.8 mm
Deflection force = 12.6 N
Deflection = 4.4 mm

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 28
Standard line of timing belt pulleys
Pitch 8 mm
Poly Chain® 8M-12 All dimensions in mm
Timing belt
pulley designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Comment: The timing belt pulleys are available in grey cast iron or
steel. Both types provide the required durability and reliability. We
reserve the right to deliver standard pulleys in either version.
In case of peripheral speeds higher than 40 m/s, please contact our
application engineers.
Rim
flange
A B E F K L M Weight
(kg)
Mass
moment of
inertia 10-4 (kgm2 )
8M-22S-12 22 1F* VB/12 28** 56.02 54.42 60 – 43 10 20 – 30 – 0.42 1.44
8M-25S-12 25 2F* 1108 28 63.66 62.06 70 – 49 2 20 – 22 – 0.43 2.11
8M-28S-12 28 2F* 1108 28 71.30 69.70 75 – 56 2 20 – 22 – 0.60 3.79
8M-30S-12 30 2F* 1210 32 76.39 74.79 82,5 – 60 5 20 – 25 – 0.67 5.16
8M-32S-12 32 2F* 1610 42 81.49 79.89 87 – 66 5 20 – 25 – 0.77 6.55
8M-34S-12 34 2F* 1610 42 86.58 84.98 91 – 69 5 20 – 25 – 0.88 8.27
8M-36S-12 36 2F* 1610 42 91.67 90.07 97 – 76 5 20 – 25 – 1.02 11.06
8M-38S-12 38 2F* 1610 42 96.77 95.17 102 – 78 5 20 – 25 – 1.15 13.52
8M-40S-12 40 2F* 1610 42 101.86 100.26 106 – 85 5 20 – 25 – 1.19 15.38
8M-45S-12 45 2F* 2012 50 114.59 112.99 120 – 92 12 20 – 32 – 1.76 27.16
8M-48S-12 48 2F* 2012 50 122.23 120.63 128 – 103 12 20 – 32 – 2.16 39.27
8M-50S-12 50 2F* 2012 50 127.32 125.72 135 – 104 12 20 _ 32 – 2.28 43.43
8M-56S-12 56 2F* 2012 50 142.60 141.00 150 – 104 12 20 – 32 – 2.83 66.17
8M-60S-12 60 2F* 2012 50 152.79 151.19 158 – 111 12 20 – 32 _ 3.24 87.72
8M-64S-12 64 2F* 2012 50 162.97 161.37 168 – 111 12 20 – 32 – 3.51 103.96
8M-75S-12 75 2* 2012 50 190.99 189.39 – – 111 12 20 – 32 – 4.57 182.30
8M-80S-12 80 2* 2012 50 203.72 202.12 – – 111 12 20 – 32 – 5.13 234.08
8M-90S-12 90 2* 2012 50 229.18 227.58 – – 111 12 20 – 32 – 6.37 372.11
Poly Chain® 8M-21 All dimensions in mm
Timing belt
pulley designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Rim
flange
A B E F K L M Weight
(kg)
Mass
moment of
inertia 10-4 (kgm2 )
8M-22S-21 22 1F* VB/12 28** 56.02 54.42 60 – 43 10 30 – 40 – 0.57 1.99
8M-25S-21 25 1F* 1108 28 63.66 62.06 70 – – – 30 8 22 – 0.60 2.92
8M-28S-21 28 3F* 1210 32 71.30 69.70 75 – – – 30 5 25 – 0.75 4.80
8M-30S-21 30 3F* 1210 32 76.39 74.79 82,5 – – – 30 5 25 – 0.83 6.42
8M-32S-21 32 3F* 1610 42 81.49 79.89 87 – – – 30 5 25 – 0.97 8.40
8M-34S-21 34 3F* 1610 42 86.58 84.89 91 – – – 30 5 25 – 1.12 10.83
8M-36S-21 36 3F* 1610 42 91.67 90.07 97 – – – 30 5 25 – 1.29 13.99
8M-38S-21 38 3F* 1610 42 96.77 95.17 102 – – – 30 5 25 – 1.34 16.02
8M-40S-21 40 3F* 1610 42 101.86 100.26 106 – – – 30 5 25 – 1.50 19.74
8M-45S-21 45 2F* 2012 50 114.59 112.99 120 – 92 2 30 – 32 – 2.03 32.88
8M-48S-21 48 2F* 2012 50 122.23 120.63 128 – 103 2 30 – 32 – 2.24 42.90
8M-50S-21 50 2F* 2012 50 127.32 125.72 135 – 104 2 30 – 32 – 2.42 49.20
8M-56S-21 56 2F* 2012 50 142.60 141.00 150 – 111 2 30 – 32 – 3.20. 80.30
8M-60S-21 60 2F* 2517 60 152.79 151.19 158 – 124 15 30 – 45 – 4.66 127.25
8M-64S-21 64 2F* 2517 60 162.97 161.37 168 – 124 15 30 – 45 – 5.28 158.77
8M-75S-21 75 2* 2517 60 190.99 189.39 – – 124 15 30 – 45 – 6.77 276.69
8M-90S-21 80 2* 2517 60 203.72 202.12 – – 124 15 30 – 45 – 7.61 353.26
8M-80S-21 90 9* 2517 60 229.18 227.58 – 198 124 – 30 7.5 45 7.5 8.57 499.05
8M-112S-21 112 9* 2517 60 285.21 283.61 – 253 124 – 30 7.5 45 7.5 12.50 1155.88
8M-140S-21 140 10* 3020 75 356.51 354.91 – 324 150 – 30 7.5 51 10.5 12.79 1699.74
* Illustrations of the types of timing belt pulley can be found on page 32.
** DIN 6885 T3
VB/12 = pre-bore (min. diameter 12 mm)
In some cases, the use of standard pulleys – depending on the
bore diameter and loads – can exceed the slipping torques of the
Taper Lock® clamping bushes. At higher torque loads, therefore,
compliance with the maximum permissible values should be
ensured.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 29
Poly Chain® 8M-36 All dimensions in mm
Timing belt
pulley designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Rim
flange
A B E F K L M Weight
(kg)
Mass
moment of
inertia 10-4 (kgm2 )
8M-25S-36 25 1F* VB/12 32 63.66 62.06 70 – 49 10 45 – 55 – 1.02 4.65
8M-28S-36 28 3F* 1210 32 71.30 69.70 75 – – – 45 – – – 1.11 6.92
8M-30S-36 30 3F* 1610 42 76.39 74.79 82,5 – – – 45 – – – 1.22 9.26
8M-32S-36 32 3F* 1610 42 81.49 79.89 87 – – – 45 – – – 1.45 12.37
8M-34S-36 34 3F* 1610 42 86.58 84.98 91 – – – 45 – – – 1.66 15.77
8M-36S-36 36 3F* 1610 42 91.67 90.07 97 – – – 45 – – – 1.90 20.28
8M-38S-36 38 3F* 1610 42 96.77 95.17 102 – – – 45 – – – 2.21 26.28
8M-40S-36 40 3F* 2012 50 101.86 100.26 106 – – – 45 – – – 2.36 31.19
8M-45S-36 45 3F* 2012 50 114.59 112.99 120 – – – 45 – – – 3.07 50.17
8M-48S-36 48 3F* 2012 50 122.23 120.63 128 – – – 45 – – – 3.30 62.31
8M-50S-36 50 3F* 2012 50 127.32 125.72 135 – – – 45 – – – 3.58 72.25
8M-56S-36 56 3F* 2517 60 142.60 141.00 150 – – – 45 – – – 4.48 115.19
8M-60S-36 60 3F* 2517 60 152.79 151.19 158 – – – 45 – – – 5.30 157.20
8M-64S-36 64 3F* 2517 60 162.97 161.37 168 – – – 45 – – – 6.19 191.32
8M-75S-36 75 2* 3020 75 190.99 189.39 – – 150 6 45 – 51 – 8.72 392.22
8M-80S-36 80 2* 3020 75 203.72 202.12 – – 150 6 45 – 51 – 9.96 505.75
8M-90S-36 90 9* 3020 75 229.18 227.58 – 197 150 – 45 3 51 3 10.41 636.42
8M-112S-36 112 9* 3020 75 285.21 283.61 – 253 150 – 45 3 51 3 14.01 1326.76
8M-140S-36 140 10* 3020 75 356.51 354.91 – 324 150 – 45 3 51 3 11.98 1747.45
8M-168S-36 168 10* 3525 100 427.81 426.21 – 396 198 – 45 10 65 10 23.91 4693.42
8M-192S-36 192 10* 3525 100 488.92 487.32 – 457 198 – 45 10 65 10 26.53 7055.91
Poly Chain® 8M-62
Timing belt
pulley designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Comment: The timing belt pulleys are available in grey cast iron or
steel. Both types provide the required durability and reliability. We
reserve the right to deliver standard pulleys in either version.
In case of peripheral speeds higher than 40 m/s, please contact our
application engineers.
Rim
flange
A B E F K L M Weight
(kg)
All dimensions in mm
Mass
moment of
inertia 10-4 (kgm2 )
8M-30S-62 30 1F* VB/20 42 76.39 74.79 82,5 – 63 12 72 – 84 – 2.45 16.25
8M-32S-62 32 1F* VB/20 50** 81.49 79.89 87 – 68 12 72 – 84 – 2.82 21.31
8M-34S-62 34 1F* VB/20 55** 86.58 84.98 91 – 69 12 72 – 84 – 3.17 28.47
8M-36S-62 36 1F* VB/20 60** 91.67 90.07 97 – 76 12 72 – 84 – 3.52 34.89
8M-38S-62 38 1F* VB/20 60 96.77 95.17 102 – 78 12 72 – 84 – 3.91 44.51
8M-40S-62 40 3F* 2012 50 101.86 100.26 106 – – – 72 – – – 3.76 49.43
8M-45S-62 45 3F* 2012 50 114.59 112.99 120 – – – 72 – – – 4.88 79.37
8M-48S-62 48 3F* 2517 60 122.23 120.63 128 – – – 72 – – – 5.52 105.81
8M-50S-62 50 3F* 2517 60 127.32 125.72 135 – – – 72 – – – 6.03 123.91
8M-56S-62 56 6F* 2517 60 142.60 141.00 150 111 - – 72 13.5 45 13.5 5.43 152.66
8M-60S-62 60 6F* 2517 60 152.79 151.19 158 121 – – 72 13.5 45 13.5 6.33 204.79
8M-64S-62 64 6F* 2517 60 162.97 161.37 168 131 – – 72 13.5 45 13.5 7.11 258.10
8M-75S-62 75 6* 3020 75 190.99 189.39 – 159 – – 72 10.5 51 10.5 9.99 485.34
8M-80S-62 80 6* 3020 75 203.72 202.12 – 172 – – 72 10.5 51 10.5 11.44 628.73
8M-90S-62 90 6* 3020 75 229.18 227.58 – 197 – – 72 10.5 51 10.5 14.94 1045.29
–
8M-112S-62 112 7* 3020 75 285.21 283.61 – 253 150 – 72 10.5 51 10.5 14.94 1540.46
8M-140S-62 140 7* 3525 100 356.51 354.91 – 324 198 – 72 3.5 65 3.5 24.77 3953.51
8M-168S-62 168 8* 3525 100 427.81 426.21 – 396 198 – 72 3.5 65 3.5 28.39 5812.58
8M-192S-62 192 8* 3525 100 488.92 487.32 – 457 198 – 72 3.5 65 3.5 32.18 8880.82
* Illustrations of the types of timing belt pulley can be found on page 32.
** DIN 6885 T3
VB/12 = pre-bore (min. diameter 12 mm)
In some cases, the use of standard pulleys – depending on the
bore diameter and loads – can exceed the slipping torques of the
Taper Lock® clamping bushes. At higher torque loads, therefore,
compliance with the maximum permissible values should be
ensured.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 30
Pitch 14 mm
Poly Chain® 14M-37 All dimensions in mm
Timing
belt pulley
designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Comment: The timing belt pulleys are available in grey cast iron or
steel. Both types provide the required durability and reliability. We
reserve the right to deliver standard pulleys in either version.
In case of peripheral speeds higher than 40 m/s, please contact our
application engineers.
Rim
flange
A B E F K L M Weight
(kg)
Mass
moment of
inertia 10-4 (kgm2 )
14M-28S-37 28 5F* 2012 50 124.78 121,98 128 88 – – 51 – 32 19 2.97 62.80
14M-30S-37 30 6F* 2517 60 133.69 130.89 138 98 – – 51 3 45 3 3.81 84.85
14M-32S-37 32 6F* 2517 60 142.60 139.80 154 100 – – 51 3 45 3 4.53 116.65
14M-34S-37 34 6F* 2517 60 151.52 148.72 160 109 – – 51 3 45 3 5.06 142.79
14M-36S-37 36 5F* 2517 60 160.43 157.63 168 117 – – 51 – 45 6 5.92 172.60
14M-38S-37 38 5F* 2517 60 169.34 166.54 183 126 – – 51 – 45 6 6.51 230.24
14M-40S-37 40 5F* 2517 60 178.25 175.45 188 135 – – 51 – 45 6 7.31 288.92
14M-44S-37 44 3F* 3020 75 196.08 193.28 211 – – – 51 – – – 9.44 452.35
14M-48S-37 48 3F* 3020 75 213.90 211.11 226 – – – 51 – – – 11.44 646.57
14M-50S-37 50 3F* 3020 75 222.82 220.02 240 – – – 51 – – – 12.62 780.73
14M-56S-37 56 7F* 3020 75 249.55 246.76 256 207 144 – 51 0 51 0 12.70 973.88
14M-60S-37 60 7* 3020 75 267.38 264.58 – 224 159 – 51 0 51 0 14.23 1191.25
14M-64S-37 64 7* 3020 75 285.21 282.41 – 242 159 – 51 0 51 0 15.58 1489.35
14M-72S-37 72 7* 3020 75 320.86 318.06 – 278 159 – 51 0 51 0 17.24 2099.86
14M-80S-37 80 7* 3020 75 356.51 353.71 – 314 159 – 51 0 51 0 20.32 3097.72
90
14M-90S-37 8* 3020 75 401.07 398.27 – 360 159 – 51 0 51 0 29.85 6445.74
14M-112S-37 112 8* 3020 75 499.11 496.31 – 456 159 – 51 0 51 0 27.43 9264.40
14M-140S-37 140 10* 3525 100 623.89 621.09 – 581 206 – 51 7 65 7 33.55 15022.96
14M-168S-37 168 10* 3525 100 748.66 745.87 – 706 206 – 51 7 65 7 64.50 47001.90
14M-192S-37 192 10* 4030 115 855.61 852.82 – 812 215 – 51 12.5 76 12.5 83.82 81467.11
Poly Chain® 14M-68
Timing
belt pulley
designation
Number
of
teeth
Timing
belt pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Rim
flange
A B E F K L M Weight
(kg)
All dimensions in mm
Mass
moment of
inertia 10-4 (kgm2 )
14M-34S-68 34 1F* VB/40 100 151.52 148.72 160 – 132 20 84 – 104 – 6.25 234.69
14M-36S-68 36 1F* VB/40 110** 160.43 157.63 168 – 131 20 84 – 104 – 6.68 273.17
14M-38S-68 38 1F* VB/40 115** 169.34 166.54 183 – 141 20 84 – 104 – 7.46 359.51
14M-40S-68 40 1F* VB/40 125** 178.25 175.45 188 – 156 20 84 – 104 – 7.81 430.15
14M-44S-68 44 6F* 3020 75 196.08 193.28 211 153 – – 84 16.5 51 16.5 11.54 604.33
14M-48S-68 48 5F* 3020 75 213.90 211.11 226 171 – – 84 – 51 33 13.74 850.56
14M-50S-68 50 6F* 3525 100 222.82 220.02 240 180 – – 84 9.5 65 9.5 16.63 1110.47
14M-56S-68 56 6F* 3525 100 249.55 246.76 256 207 – – 84 9.5 65 9.5 21.15 1740.42
14M-60S-68 60 6* 3525 100 267.38 264.58 – 224 – – 84 9.5 65 9.5 24.28 2250.33
14M-64S-68 64 6* 3525 100 285.21 282.41 – 242 – – 84 9.5 65 9.5 27.86 2925.48
14M-72S-68 72 7* 3525 100 320.86 318.06 – 278 – – 84 9.5 65 9.5 25.74 3353.92
14M-80S-68 80 7* 3525 100 356.51 353.71 – 314 – – 84 9.5 65 9.5 29.86 4827.78
14M-90S-68 90 8* 3525 100 401.07 398.27 – 360 – – 84 9.5 65 9.5 31.24 6694.20
14M-112S-68 112 8* 3525 100 499.11 496.31 – 456 – – 84 9.5 65 9.5 39.25 13299.34
14M-140S-68 140 8* 3525 100 623.89 621.09 581 – – 84 9.5 65 9.5 40.87 21569.65
14M-168S-68 168 8* 3525 100 748.66 745.87 – 706 – – 84 9.5 65 9.5 73.30 58491.40
14M-192S-68 192 8* 4030 115 855.61 852.82 – 812 – – 84 4 76 4 94.21 99321.99
* Illustrations of the types of timing belt pulley can be found on page 32.
** DIN 6885 T3
VB/40 = pre-bore (min. diameter 12 mm)
In some cases, the use of standard pulleys – depending on the
bore diameter and loads – can exceed the slipping torques of the
Taper Lock® clamping bushes. At higher torque loads, therefore,
compliance with the maximum permissible values should be
ensured.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 31
Poly Chain® 14M-90 All dimensions in mm
Timing
belt pulley
designation
Number
of
teeth
Timing
belt
pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Comment: The timing belt pulleys are available in grey cast iron or
steel. Both types provide the required durability and reliability.
We reserve the right to deliver standard pulleys in either version.
In case of peripheral speeds higher than 40 m/s, please contact our
application engineers.
Rim
flange
A B E F K L M Weight
(kg)
Mass
moment of
inertia 10-4 (kgm2 )
14M-36S-90 36 1F* VB/50 110** 160.43 157.63 168 – 131 30 106 – 136 – 8.15 333.81
14M-38S-90 38 1F* VB/50 115** 169.34 166.50 183 – 141 30 106 – 136 – 9.73 467.27
14M-40S-90 40 1F* VB/50 125** 178.25 175.45 188 – 156 30 106 – 136 – 10.29 564.50
14M-44S-90 44 1F* VB/50 140** 196.08 193.28 211 – 169 30 106 – 136 – 11.92 805.17
14M-48S-90 48 6F* 3525 100 213.90 211.11 226 171 – – 106 20 66 20 16.76 1069.46
14M-50S-90 50 6F* 3525 100 222.82 220.02 240 180 – – 106 20 66 20 18.38 1272.88
14M-56S-90 56 6F* 3525 100 249.55 246.76 256 207 – – 106 20 66 20 23.46 2016.82
14M-60S-90 60 6* 3525 100 267.38 264.58 – 224 – – 106 20 66 20 26.53 2558.85
14M-64S-90 64 6* 3525 100 285.21 282.41 – 242 – – 106 20 66 20 30.30 3308.24
14M-72S-90 72 7* 3525 100 320.86 318.06 – 278 178 – 106 20 66 20 26.36 3633.18
14M-80S-90 80 7* 4030 115 356.51 353.71 – 314 215 – 106 15 76 15 35.61 5650.71
14M-90S-90 90 7* 4030 115 401.07 398.27 – 360 215 – 106 15 76 15 41.90 7979.09
14M-112S-90 112 8* 4535 125 499.11 469.31 – 456 215 – 106 8 90 8 70.89 23322.89
14M-140S-90 140 8* 4535 125 623.89 621.09 – 581 215 – 106 8 90 8 74.56 39744.58
14M-168S-90 168 8* 5040 130** 748.66 745.87 – 706 267 – 106 2 102 2 109.24 77064.15
14M-192S-90 192 8* 5040 130** 855.61 852.82 – 812 267 – 106 2 102 2 126.05 119340.31
Poly Chain® 14M-125
Timing
belt pulley
designation
Number
of
teeth
Timing
belt
pulley
type
Bush
number
Max.
bore
holes
Diameter
Pitch Outer
Rim
flange
A B E F K L M Weight
(kg)
All dimensions in mm
Mass
moment of
inertia 10-4 (kgm2 )
14M-38S-125 38 1F* VB/50 115** 169.34 166.54 183 – 141 20 141 – 161 – 11.74 566.16
14M-40S-125 40 1F* VB/50 125** 178.25 175.45 188 – 156 20 141 – 161 – 12.23 673.08
14M-44S-125 44 1F* VB/50 140** 196.08 193.28 211 – 169 20 141 – 161 – 14.46 981.64
14M-48S-125 48 1F* VB/50 160** 213.90 211.11 226 – 185 20 141 – 161 – 14.70 1239.87
14M-50S-125 50 6F* 3525 100 222.82 220.02 240 180 – – 141 38 65 38 20.93 1527.53
14M-56S-125 56 6F* 3525 100 249.55 246.76 256 207 – – 141 38 65 38 25.91 2366.65
14M-60S-125 60 6* 4030 115 267.38 264.58 – 224 – – 141 32.5 76 32.5 30.92 3083.08
14M-64S-125 64 6* 4030 115 285.21 282.41 – 242 – – 141 32.5 76 32.5 35.34 3979.74
14M-72S-125 72 7* 4030 115 320.86 318.06 – 278 215 – 141 32.5 76 32.5 37.71 5201.08
14M-80S-125 80 7* 4030 115 356.51 353.71 – 314 215 – 141 32.5 76 32.5 42.02 7133.19
14M-90S-125 90 7* 4030 115 401.07 398.27 – 360 215 – 141 32.5 76 32.5 51.29 11031.63
14M-112S-125 112 8* 4535 125 499.11 496.31 – 456 215 – 141 26 89 26 65.64 22771.41
14M-140S-125 140 8* 4535 125 623.89 621.09 – 581 215 – 141 26 89 26 67.90 38083.37
14M-168S-125 168 8* 5040 125 748.66 745.87 – 706 267 – 141 19.5 102 19.5 120.66 90872.96
14M-192S-125 192 8* 5040 125 855.61 825.82 – 812 267 – 141 19.5 102 19.5 142.39 144192.26
* Illustrations of the types of timing belt pulley can be found on page 32.
** DIN 6885 T3
VB/40 = pre-bore (xmin. diameter 40 mm)
In some cases, the use of standard pulleys – depending on the
bore diameter and loads – can exceed the slipping torques of the
Taper Lock® clamping bushes. At higher torque loads, therefore,
compliance with the maximum permissible values should be
ensured.

Walther Flender Gruppe
PolyChain ® GT Timing Belts PAGE 32
Models
Type 1F Type 2 Type 2F Type 3F Type 5F Type 6 Type 6F
Type 7 Type 7F Type 8 Type 9 Type 9F Type 10

Clamping sets

Walther Flender Gruppe
Clamping sets Page 34
General features
MLC clamping sets provide a positive-locking, backlash-free
connection that can be released at any time. This protects components
such as the shaft and hub from damage from the phenomenon
known as excursion. The applications of the MLC clamping
sets range from construction machinery to robots. Distinguishing
features include easy mounting and removal with standard tools
and easy adjustment without profile end mating. MLC clamping
sets transfer torques and axial forces frictionally and backlash-free
between cylindrical shafts and bore holes of the drive elements.
MLC clamping sets feature the following advantages over positive
locking connections:
Calculation instructions
Transmission elements
For dimensioning of a connection between the shaft and hub,
the maximum occurring loads (rated value x load factor) have
to be reliably determined and included in the calculation.
The transmissible values listed in the table for M t and F AX apply
to the tightening torques M S and cannot be transmitted simultaneously.
For simultaneous acting torque and axial load, the resulting value
M R has to be calculated. This value cannot be greater than the
transmissible torque M t.
The resulting transmitted torque in the case of simultaneous
action of torque and axial force is
M R = √M B 2 + (FAB · d/2) 2 (Nm)
Condition: M R ≤ M t
Symbols
d = shaft diameter (mm)
D = inner hub diameter (mm)
A = hub/clamping set contact surface (mm 2 )
H, H 1, H 2, H 3 = width dimensions (mm)
L = overall width with screws
F AX = transmissible axial force without torque (kN)
• Low-cost manufacture of the cylindrical press fits for the
clamping sets on shafts and hubs
• Backlash-free connection; can be accurately positioned axially
and peripherally
• Reduces notch effect
• Small shaft diameter due to use of the full, non-weakened
shaft diameter
• Extremely fail-safe under changing and intermittent loads
• Convenient and reliable dimensioning of the clamping sets
• Easy to install and remove using standard tools
• Can be reused and exchanged for numerous applications
• Ready-to-install and adaptable line of models
• Excellent squareness and concentricity
• Prevents fretting corrosion
• Higher power transmission than feather keys
Operational overloads that cause the clamping set to slip are
not permitted.
Information on calculation for specific models is provided
separately.
The transmissible forces and torques are based on the axial
initial tension of the screws exerted positively through the
conical surfaces as normal radial forces onto the shaft and hub
connection.
Every user has to use a torque wrench to carefully check the
tightening torques M S.
M t = transmissible torque (Nm)
M S = tightening torque per screw (Nm)
M B = rated torque to be transmitted (Nm)
F AB = axial force to be transmitted (kN)
p W = surface pressure on the shaft (N/mm 2 )
p W = surface pressure on the hub (N/mm 2 )

Walther Flender Gruppe
Clamping sets Page 35
Hub calculation
The hub material is subjected to tensile stress by the pressure of
the clamping set in the bore. The required outer hub diameter depends
on the material, the installation position of the clamping set
and the surface pressure in the hub bore. To keep the stress within
the flexible range, the yield point R p0,2 is the permissible material
property value.
The following table shows hub diameter factors based on the
three parameters mentioned above. The hub factor X is determined
based on the installation position. The calculated surface
pressure p N can be taken from the table with the selected clamping
set type. The corresponding hub coefficient for these two values
is found under the yield point of the hub material in the table.
The product of the hub coefficient and the outer diameter D of the
clamping set is the minimum outer hub diameter.
D N = D · K
Installation situation
Single clamping sets without
hub centring for shortest hub
width B ≥ H (length of the adjacent
clamping rings)
Single clamping sets without
hub centring with width
B ≥ 2 · H and multiple clamping
sets with hub centring and
width B ≥ H (1 + z)
z = number of clamping sets
Single clamping sets with hub
centring for hub width B ≥ 2 · H
Hub factor
X = 1
X = 0,8
X = 0,6
When selecting the hub material, take into account that the calculated
surface pressure pN cannot be greater than the yield point
R p0,2.
Examples
1. Hub material C 35
Yield point 270 N/mm 2
Clamping set MLC 5000 A 45 x 75
Factor x = 1, p N = 120 N/mm 2
Outer hub diameter D N = 75 x 1.62 = ca. 122 mm
2. Hub material GG 25
Yield point 180 N/mm 2
Clamping set MLC 7000 55 x 85
Factor x = 1, p N = 80 N/mm 2
Outer hub diameter D N = 85 x 1.62 = ca. 138 mm
If the hub is weakened by bores or threads, the following
applies: X = 0,8 for B ≥ 2H or B ≥ H 1 (1 + z)
X = 1 for B = H or B = H 1 · z

Walther Flender Gruppe
Clamping sets Page 36
Hub coefficient K
Surface
pressure
pN N/mm2 Yield point Rp0,2 of the hub material (N/mm
Hub
factor
X
2 )
150
GG 22
180
GG 25
GG 38
200
GG 30
GTS 35
220
GS 45
St 37-2
250
GGG 40
GS 52
270 300
Hub materials
St 50-2 GGG 50
C 35 St 60-2
350
GGG 60
GS 62
400
GGG 70
GS 70
450
AlZn 5,5 MgCu
25 CrMo4
600
42CrMo4
AlCu4MgSi
C 45 St 70-2 C 60
0.6 1.29 1.26 1.21 1.19 1.16 1.15 1.13 1.11 1.10 1.09 1.07
60 0.8 1.40 1.31 1.25 1.24 1.23 1.21 1.19 1.16 1.13 1.12 1.09
1 1.53 1.43 1.37 1.33 1.29 1.26 1.23 1.19 1.17 1.15 1.11
0.6 1.31 1.26 1.23 1.21 1.19 1.16 1.14 1.12 1.11 1.10 1.08
65 0.8 1.45 1.36 1.31 1.29 1.25 1.23 1.21 1.17 1.15 1.13 1.10
1 1.61 1.46 1.41 1.36 1.31 1.29 1.25 1.21 1.19 1.1 1.13
0.6 1.35 1.27 1.25 1.23 1.19 1.17 1.16 1.13 1.12 1.11 1.08
70 0.8 1.49 1.39 1.35 1.31 1.26 1.24 1.21 1.19 1.16 1.14 1.11
1 1.66 1.51 1.46 1.41 1.35 1.31 1.26 1.23 1.21 1.18 1.14
0.6 1.31 1.29 1.26 1.24 1.21 1.19 1.16 1.15 1.13 1.12 1.09
75 0.8 1.53 1.43 1.37 1.33 1.29 1.26 1.23 1.19 1.17 1.15 1.12
1 1.75 1.56 1.49 1.43 1.37 1.34 1.31 1.26 1.21 1.19 1.14
0.6 1.40 1.32 1.29 1.26 1.22 1.21 1.19 1.16 1.14 1.12 1.09
80 0.8 1.59 1.46 1.40 1.36 1.31 1.28 1.25 1.21 1.19 1.16 1.12
1 1.82 1.62 1.54 1.47 1.40 1.37 1.32 1.27 1.23 1.21 1.15
0.6 1.43 1.35 1.31 1.28 1.24 1.22 1.20 1.17 1.15 1.13 1.10
85 0.8 1.64 1.50 1.43 1.39 1.33 1.30 1.27 1.23 1.20 1.17 1.13
1 1.91 1.68 1.58 1.51 1.43 1.40 1.35 1.29 1.25 1.22 1.16
0.6 1.47 1.37 1.33 1.29 1.26 1.23 1.21 1.18 1.16 1.14 1.10
90 0.8 1.70 1.54 1.47 1.41 1.35 1.32 1.29 1.24 1.21 1.19 1.14
1 2.01 1.74 1.63 1.55 1.47 1.42 1.37 1.31 1.27 1.23 1.17
0.6 1.50 1.40 1.35 1.31 1.27 1.25 1.22 1.19 1.16 1.15 1.11
95 0.8 1.76 1.58 1.50 1.44 1.38 1.35 1.31 1.26 1.22 1.20 1.15
1 2.12 1.81 1.69 1.60 1.50 1.45 1.40 1.33 1.28 1.25 1.18
0.6 1.54 1.42 1.37 1.33 1.29 1.26 1.23 1.20 1.17 1.15 1.12
100 0.8 1.82 1.62 1.54 1.47 1.40 1.37 1.32 1.27 1.23 1.21 1.15
1 2.25 1.88 1.74 1.64 1.54 1.49 1.42 1.35 1.30 1.26 1.19
0.6 1.57 1.45 1.40 1.35 1.30 1.28 1.25 1.21 1.18 1.16 1.12
105 0.8 1.89 1.67 1.57 1.51 1.43 1.39 1.34 1.29 1.25 1.22 1.16
1 2.39 1.96 1.80 1.69 1.57 1.52 1.45 1.37 1.32 1.28 1.20
0.6 1.61 1.48 1.42 1.37 1.32 1.29 1.26 1.22 1.19 1.17 1.13
110 0.8 1.97 1.72 1.61 1.54 1.45 1.41 1.36 1.30 1.26 1.23 1.17
1 2.56 2.05 1.87 1.74 1.61 1.55 1.48 1.39 1.34 1.29 1.21
0.6 1.65 1.51 1.44 1.37 1.34 1.31 1.27 1.23 1.20 1.18 1.13
115 0.8 2.05 1.77 1.65 1.57 1.48 1.44 1.38 1.32 1.27 1.24 1.18
1 2.76 2.14 1.94 1.80 1.65 1.59 1.51 1.42 1.35 1.31 1.22
0.6 1.70 1.54 1.47 1.40 1.35 1.32 1.29 1.24 1.21 1.19 1.14
120 0.8 2.14 1.82 1.70 1.61 1.51 1.46 1.40 1.34 1.29 1.25 1.19
1 3.01 2.25 2.01 1.85 1.70 1.62 1.54 1.44 1.37 1.32 1.23
0.6 1.74 1.57 1.49 1.44 1.37 1.34 1.30 1.25 1.22 1.19 1.14
125 0.8 2.25 1.88 1.74 1.64 1.54 1.49 1.42 1.35 1.30 1.26 1.19
1 3.33 2.36 2.09 1.92 1.74 1.66 1.57 1.46 1.39 1.34 1.25
0.6 1.79 1.60 1.52 1.46 1.39 1.36 1.31 1.26 1.23 1.20 1.15
130 0.8 2.36 1.94 1.79 1.68 1.57 1.51 1.45 1.37 1.31 1.28 1.20
1 3.75 2.50 2.18 1.98 1.79 1.70 1.60 1.49 1.41 1.36 1.26
0.6 1.84 1.62 1.55 1.48 1.41 1.37 1.33 1.28 1.24 1.21 1.16
135 0.8 2.49 2.01 1.84 1.72 1.60 1.54 1.47 1.39 1.33 1.20 1.21
1 4.37 2.66 2.28 2.05 1.84 1.74 1.63 1.51 1.43 1.37 1.27
0.6 1.89 1.67 1.57 1.51 1.43 1.39 1.34 1.29 1.25 1.22 1.16
140 0.8 2.64 2.08 1.89 1.76 1.63 1.55 1.49 1.40 1.34 1.30 1.22
1 5.40 2.84 2.39 2.13 1.89 1.79 1.67 1.54 1.45 1.39 1.28
0.6 1.95 1.70 1.60 1.53 1.45 1.41 1.36 1.30 1.26 1.23 1.17
145 0.8 2.81 2.16 1.95 1.81 1.66 1.59 1.51 1.42 1.36 1.31 1.23
1 7.67 3.06 2.51 2.22 1.95 1.83 1.70 1.56 1.47 1.41 1.29
0.6 2.01 1.74 1.63 1.55 1.47 1.42 1.37 1.31 1.27 1.24 1.17
150 0.8 3.01 2.25 2.01 1.85 1.70 1.62 1.54 1.44 1.37 1.32 1.24
1 - 3.33 2.66 2.31 2.01 1.88 1.74 1.59 1.49 1.42 1.30
0.6 2.07 1.78 1.66 1.58 1.49 1.44 1.39 1.32 1.28 1.25 1.18
155 0.8 3.26 2.34 2.07 1.90 1.73 1.66 1.56 1.46 1.39 1.34 1.24
1 - 3.67 2.81 2.41 2.07 1.93 1.78 1.62 1.52 1.44 1.31
0.6 2.14 1.82 1.70 1.61 1.51 1.46 1.40 1.34 1.29 1.25 1.19
160 0.8 3.56 2.44 2.14 1.95 1.77 1.68 1.59 1.48 1.40 1.35 1.25
1 - 4.13 3.01 2.53 2.14 1.99 1.82 1.65 1.54 1.48 1.32
0.6 2.22 1.87 1.73 1.63 1.53 1.48 1.42 1.35 1.30 1.26 1.19
165 0.8 3.97 2.56 2.22 2.01 1.81 1.72 1.61 1.50 1.42 1.36 1.26
1 - 4.81 3.24 2.66 2.22 2.05 1.87 1.68 1.56 1.48 1.34

Walther Flender Gruppe
Clamping sets Page 37
Description of models & tables
MLC 3000
This clamping set is self-centring with
excellent concentricity. The extremely
small outer diameter is space-saving
and suitable for small wheel diameters.
The spacer ring between the outer
flange and the hub maintains the fitting
position in the axial direction to enable
exact positioning without a shaft collar.
The push-off threads in the outer flanges
are used for dismantling.
H
d
D
Size Dimensions Screws Torque
Axial
force
FAX kN
Surface
pressures
pw N/mm2 pN N/mm2 d x D
mm
D1 mm
H
mm
H1 mm
H2 mm
L
mm
DIN 912
12.9
M S
Nm
Mt Nm
6 x 14 25 10 19.5 21 24 M 3 2 14 4.8 201 86
8 x 15 27 11.5 22 25 29 M 4 5 28 7 197 105
9 x 16 28 14 22 26 30 M 4 5 41 9 192 108
10 x 16 29 14 22 26 30 M 4 5 46 9 173 108
11 x 18 32 13.5 23 26 30 M 4 5 50 9 164 100
12 x 18 32 13.5 23 26 30 M 4 5 55 9 150 100
14 x 23 38 14 23 26 30 M 4 5 64 9 123 75
15 x 24 44 16 33 36 42 M 6 15 150 19 208 130
16 x 24 44 16 33 36 42 M 6 15 150 19 195 130
17 x 25 45 16 33 36 42 M 6 15 162 19 184 125
17 x 26 47 18 33 38 44 M 6 17 180 23 187 122
18 x 26 47 18 33 38 44 M 6 17 200 23 173 120
19 x 27 48 18 33 38 44 M 6 17 210 23 171 120
20 x 28 49 18 33 38 44 M 6 17 220 23 168 120
22 x 32 54 25 40 45 51 M 6 17 250 23 102 70
24 x 34 56 25 40 45 51 M 6 17 270 23 99 70
25 x 34 56 25 40 45 51 M 6 17 280 23 95 70
28 x 39 61 25 40 45 51 M 6 17 500 34 125 90
30 x 41 62 25 40 45 51 M 6 17 520 34 115 84
32 x 43 65 25 40 45 51 M 6 17 730 46 155 115
35 x 47 69 30 45 50 56 M 6 17 800 46 109 81
38 x 50 72 30 45 50 56 M 6 17 900 46 100 76
40 x 53 75 30 45 50 56 M 6 17 900 46 95 72
42 x 55 78 32 51 57 65 M 8 41 1800 84 164 125
45 x 59 85 40 59 65 73 M 8 41 1900 84 117 89
48 x 62 87 45 64 70 78 M 8 41 2000 84 97 75
50 x 65 92 45 64 70 78 M 8 41 2600 105 117 90
55 x 71 98 50 69 75 83 M 8 41 2900 105 90 70
60 x 77 104 50 69 75 83 M 8 41 3100 105 90 70
65 x 84 111 50 69 75 83 M 8 41 3400 105 78 60
70 x 90 119 60 84 91 101 M 10 83 5800 170 103 80
75 x 95 126 60 84 91 101 M 10 83 6200 170 89 70
80 x 100 131 65 89 96 106 M 10 83 7800 200 100 80
85 x 106 137 65 89 96 106 M 10 83 8500 200 87 70
90 x 112 143 65 89 96 106 M 10 83 11200 250 112 90
95 x 120 153 65 89 96 106 M 10 83 11800 250 101 80
100 x 125 162 65 94 102 114 M 12 145 14600 300 119 95
110 x 140 180 90 120 128 140 M 12 145 16000 300 78 61
120 x 155 198 90 120 128 140 M 12 145 17400 300 71 55
Recommended shaft/hub fitting tolerances h8/H8

Walther Flender Gruppe
Clamping sets Page 38
MLC 5,000 A
H2
H1
L
H
H2
H3
H1
H
d
Model 5000A
D
Self-centring clamping sets for larger torques
with small, self-locking taper angles.
The diameters are the same as for the MLC
1000, but have a significantly higher transmission
force.
Type B prevents axial displacement
between the shaft and hub by means of a
stop ring, thus ensuring exact positioning
in the axial direction. Due to the additional
friction between the hub and the outer
ring, the transmissible load is somewhat
lower.
MLC 5000 B
d
Model 5000B
D
D1
Size Dimensions Screws Torque
Axial
force
Surface pressures
d x D
mm
H
mm
H1 mm
H2 mm
L
mm
DIN 912
12.9
MS Nm
Mt Nm
FAX kN
pw N/mm2 pN N/mm2 20 x 47 26 37 42 48 M 6 17 530 52 259 110
22 x 47 26 37 42 48 M 6 17 580 52 235 110
24 x 50 26 37 42 48 M 6 17 630 52 208 100
25 x 50 26 37 42 48 M 6 17 660 52 200 100
28 x 55 26 37 42 48 M 6 17 740 52 196 100
30 x 55 26 37 42 48 M 6 17 790 52 183 100
32 x 60 26 37 42 48 M 6 17 1200 70 225 120
35 x 60 26 37 42 48 M 6 17 1300 70 206 120
38 x 65 26 37 42 48 M 6 17 1300 70 188 110
40 x 65 26 37 42 48 M 6 17 1400 70 179 110
42 x 75 30 46 51 59 M 8 41 2000 100 214 120
45 x 75 30 46 51 59 M 8 41 2200 100 200 120
48 x 80 30 46 51 59 M 8 41 3200 130 250 150
50 x 80 30 46 51 59 M 8 41 3300 130 240 150
55 x 85 30 46 51 59 M 8 41 3600 130 216 140
60 x 90 30 46 51 59 M 8 41 3900 130 195 130
65 x 95 30 46 51 59 M 8 41 4300 130 175 120
70 x 110 40 54 60 70 M 10 83 7500 210 204 130
75 x 115 40 54 60 70 M 10 83 8000 210 199 130
80 x 120 40 54 60 70 M 10 83 8500 210 180 120
85 x 125 40 54 60 70 M 10 83 11400 270 221 150
90 x 130 40 54 60 70 M 10 83 12000 270 202 140
95 x 135 40 54 60 70 M 10 83 12600 280 192 135
100 x 145 45 61 68 80 M 12 145 15000 300 189 130
110 x 155 45 61 68 80 M 12 145 16500 300 169 120
120 x 165 45 61 68 80 M 12 145 22500 370 193 140
130 x 180 45 61 68 80 M 12 145 29000 450 208 150
140 x 190 50 68 76 90 M 14 210 32000 460 176 130
150 x 200 50 68 76 90 M 14 210 41000 550 200 150
160 x 210 50 68 76 90 M 14 210 44000 550 184 140
170 x 225 50 68 76 90 M 14 210 54500 640 212 160
180 x 235 50 68 76 90 M 14 210 57500 640 196 150
Recommended shaft/hub fitting tolerances h8/H8
Size Dimensions Screws Torque
Axialkraft
Surface pressures
d x D
mm
D1 mm
H
mm
H1 mm
H2 mm
H3 mm
L
mm
DIN 912
12.9
MS Nm
Mt Nm
FAX kN
pw N/mm2 pN N/mm2 20 x 47 53 26 37 42 31 48 M 6 17 320 33 165 70
22 x 47 53 26 37 42 31 48 M 6 17 360 33 150 70
24 x 50 56 26 37 42 31 48 M 6 17 390 33 146 70
25 x 50 56 26 37 42 31 48 M 6 17 400 33 140 70
28 x 55 61 26 37 42 31 48 M 6 17 450 33 118 60
30 x 55 61 26 37 42 31 48 M 6 17 490 33 110 60
32 x 60 66 26 37 42 31 48 M 6 17 690 43 131 70
35 x 60 66 26 37 42 31 48 M 6 17 750 43 120 70
38 x 65 71 26 37 42 31 48 M 6 17 820 43 120 70
40 x 65 71 26 37 42 31 48 M 6 17 860 43 114 70
42 x 75 81 30 46 51 35 59 M 8 41 1300 60 125 70
45 x 75 81 30 46 51 35 59 M 8 41 1400 60 117 70
48 x 80 86 30 46 51 35 59 M 8 41 2000 80 150 90
50 x 80 86 30 46 51 35 59 M 8 41 2000 80 144 90
55 x 85 91 30 46 51 35 59 M 8 41 2200 80 139 90
60 x 90 96 30 46 51 35 59 M 8 41 2400 80 120 80
65 x 95 101 30 46 51 35 59 M 8 41 2600 80 102 70
70 x 110 119 40 54 60 45 70 M 10 83 4600 130 126 80
75 x 115 124 40 54 60 45 70 M 10 83 5000 130 123 80
80 x 120 129 40 54 60 45 70 M 10 83 5200 130 105 70
85 x 125 134 40 54 60 45 70 M 10 83 7000 170 132 90
90 x 130 139 40 54 60 45 70 M 10 83 7400 170 116 80
95 x 135 144 40 54 60 46 70 M 10 83 7800 170 114 80
100 x 145 155 45 61 68 52 80 M 12 145 9800 190 116 80
110 x 155 165 45 61 68 52 80 M 12 145 10700 190 99 70
120 x 165 175 45 61 68 52 80 M 12 145 14600 240 124 90
130 x 180 188 45 61 68 52 80 M 12 145 19000 300 138 100
140 x 190 199 50 68 76 58 90 M 14 230 23000 330 122 90
150 x 200 209 50 68 76 58 90 M 14 230 30000 400 133 100
160 x 210 219 50 68 76 58 90 M 14 230 32000 400 131 100
170 x 225 234 50 68 76 58 90 M 14 230 39000 460 146 110
180 x 235 244 50 68 76 58 90 M 14 230 41000 460 131 100
Recommended shaft/hub fitting tolerances h8/H8

Walther Flender Gruppe
Clamping sets Page 39
MLC 5006
L
H2
H1
L
H2
H3
H
H1
H
d
d
Model 5006
D
This is the least expensive and most
popular of all clamping sets. It differs
from the MLC 5000 in that it has a shorter
installation length, making it more suitable
for narrow, disk-shaped wheel hubs. The
diameters are the same. The MLC 5007 has
a larger flange diameter as a stop for axial
positioning of the hub. The friction between
the outer ring and the hub reduces
the transferred torque as compared with
the MLC 5006. Both models are self-centring
and self-locking in the clamping state.
Due to the high demand, these models are
always in stock.
MLC 5007
Model 5007
D
D1
Size Dimensions Screws Torque
Axial
force
Surface pressures
d x D
mm
H
mm
H1 mm
H2 mm
L
mm
DIN 912
12.9
MS Nm
Mt Nm
FAX kN
pw N/mm2 pN N/mm2 18 x 47 17 25 28 34 M 6 14 370 41 366 140
19 x 47 17 25 28 34 M 6 14 390 41 346 140
20 x 47 17 25 28 34 M 6 14 410 41 329 140
22 x 47 17 25 28 34 M 6 14 450 41 299 140
24 x 50 17 25 28 34 M 6 14 490 41 271 130
25 x 50 17 25 28 34 M 6 14 510 41 260 130
28 x 55 17 25 28 34 M 6 14 570 41 236 120
30 x 55 17 25 28 34 M 6 14 610 41 220 120
32 x 60 17 25 28 34 M 6 14 880 55 272 145
35 x 60 17 25 28 34 M 6 14 960 55 249 145
38 x 65 17 25 28 34 M 6 14 1000 55 231 135
40 x 65 17 25 28 34 M 6 14 1100 55 219 135
42 x 75 20 30 33 41 M 8 35 2200 105 339 190
45 x 75 20 30 33 41 M 8 35 2400 105 317 190
48 x 80 20 30 33.5 41 M 8 35 2500 105 292 175
50 x 80 20 30 33.5 41 M 8 35 2600 105 280 175
55 x 85 20 30 33.5 41 M 8 35 2900 105 255 165
60 x 90 20 30 33.5 41 M 8 35 3100 105 233 155
65 x 95 20 30 33.5 41 M 8 35 3400 105 219 150
70 x 110 24 36 40 50 M 10 70 6000 170 275 175
75 x 115 24 36 40 50 M 10 70 6400 170 261 170
80 x 120 24 36 40 50 M 10 70 6800 170 240 160
85 x 125 24 36 40 50 M 10 70 9000 210 279 190
90 x 130 24 36 40 50 M 10 70 9600 210 267 185
95 x 135 24 36 40 50 M 10 70 10200 210 263 185
100 x 145 26 40 44 56 M 12 115 12000 235 247 170
110 x 155 26 40 44 56 M 12 115 13000 260 225 160
120 x 165 26 40 44 56 M 12 115 16000 270 227 165
130 x 180 34 48 52 64 M 12 115 23000 350 215 155
140 x 190 34 50 54 68 M 14 185 25000 360 204 150
150 x 200 34 50 54 68 M 14 185 30000 400 207 155
160 x 210 34 50 54 68 M 14 185 38800 480 223 170
Recommended shaft/hub fitting tolerances h8/H8
Size Dimensions Screws Torque
AxialkraftFlächenpresungen
d x D
mm
D1 mm
H
mm
H1 mm
H2 mm
H3 mm
L
mm
DIN 912
12.9
MS Nm
Mt Nm
FAX kN
pw N/mm2 pN N/mm2 18 x 47 53 17 25 28 22 34 M 6 17 290 32 261 100
19 x 47 53 17 25 28 22 34 M 6 17 300 32 247 100
20 x 47 53 17 25 28 22 34 M 6 17 320 32 235 100
22 x 47 53 17 25 28 22 34 M 6 17 350 32 214 100
24 x 50 56 17 25 28 22 34 M 6 17 390 32 208 100
25 x 50 56 17 25 28 22 34 M 6 17 400 32 200 100
28 x 55 61.4 17 25 28 22 34 M 6 17 450 32 177 90
30 x 55 61.4 17 25 28 22 34 M 6 17 490 32 165 90
32 x 60 67 17 25 28 22 34 M 6 17 700 43 206 110
35 x 60 67 17 25 28 22 34 M 6 17 760 43 189 110
38 x 65 72 17 25 28 22 34 M 6 17 820 43 171 100
40 x 65 72 17 25 28 22 34 M 6 17 870 43 163 100
42 x 75 84 20 30 33 25 41 M 8 41 1700 80 250 140
45 x 75 84 20 30 33 25 41 M 8 41 1800 80 233 140
48 x 80 89 20 30 33.5 24 41 M 8 41 1900 80 217 130
50 x 80 89 20 30 33.5 24 41 M 8 41 2000 80 208 130
55 x 85 94 20 30 33.5 24 41 M 8 41 2200 80 185 120
60 x 90 99 20 30 33.5 24 41 M 8 41 2400 80 180 120
65 x 95 104 20 30 33.5 24 41 M 8 41 2600 80 161 110
70 x 110 119 24 36 40 29 41 M 10 83 4600 130 204 130
75 x 115 124 24 36 40 29 50 M 10 83 5000 130 199 130
80 x 120 129 24 36 40 29 50 M 10 83 5300 130 180 120
85 x 125 134 24 36 40 29 50 M 10 83 7000 160 221 150
90 x 130 139 24 36 40 29 50 M 10 83 7400 160 202 140
95 x 135 144 24 36 40 29 50 M 10 83 7800 160 185 130
100 x 145 154 26 40 44 31 56 M 12 145 9700 200 203 140
110 x 155 164 26 40 44 31 56 M 12 145 10700 200 183 130
120 x 165 174 26 40 44 31 56 M 12 145 14600 242 206 150
130 x 180 189 34 48 52 39 64 M 12 145 19000 300 180 130
140 x 190 199 34 50 54 39 68 M 14 230 23000 330 190 140
150 x 200 209 34 50 54 39 68 M 14 230 24500 330 173 130
160 x 210 219 34 50 54 39 68 M 14 230 31300 390 197 150
180 x 235 244 44 60 64 49 78 M 14 230 35000 390 144 110
200 x 260 269 44 60 64 49 78 M 14 230 49000 500 143 110
Recommended shaft/hub fitting tolerances h8/H8

Walther Flender Gruppe
Clamping sets Page 40
MLC 7000
This model, similar to the MLC 4000 series,
can withstand very high loads and is especially
suitable for a smaller diameter range
and a shorter installation length.
The diameter gradations are the same.
These clamping sets are self-centring and
self-locking with excellent concentricity
and runout properties, also compared with
resulting torques. The very small taper
angles mean that the clamping travel is
relatively large. The inner clamping ring
requires greater axial clearance for release
(s = 0.02 · d).
L
H2
H
Model 7000
d
D
Size Dimensions Screws Torque Axial force Surface pressures
d x D
mm
H
mm
H2 mm
L
mm
DIN 912
-12.9
MS Nm
Mt Nm
FAX kN
pw N/mm2 pN N/mm2 25 x 50 41 45 51 M 6 17 700 55 160 80
30 x 55 41 45 51 M 6 17 1200 70 165 90
35 x 60 41 45 51 M 6 17 1400 70 154 90
40 x 65 41 45 51 M 6 17 2000 90 163 100
45 x 75 41 45 51 M 8 41 3200 140 217 130
50 x 80 58 62 70 M 8 41 3600 140 128 80
55 x 85 58 62 70 M 8 41 4000 140 124 80
60 x 90 58 62 70 M 8 41 5400 170 135 90
65 x 95 58 62 70 M 8 41 5800 170 132 90
70 x 110 70 76 86 M 10 83 10300 280 157 100
75 x 115 70 76 86 M 10 83 11000 280 153 100
80 x 120 70 76 86 M 10 83 14000 340 165 110
85 x 125 70 76 86 M 10 83 15000 340 162 110
90 x 130 70 76 86 M 10 83 16000 310 144 100
95 x 135 70 76 86 M 10 83 17000 340 142 100
100 x 145 92 98 110 M 12 145 26000 500 145 100
110 x 155 92 98 110 M 12 145 29000 500 141 100
120 x 165 92 98 110 M 12 145 36400 600 151 110
130 x 180 108 114 128 M 14 230 45400 700 138 100
140 x 190 108 114 128 M 14 230 57000 800 149 110
150 x 200 108 114 128 M 14 230 70000 900 160 120
160 x 210 108 114 128 M 14 230 75000 900 144 110
170 x 225 132 146 162 M 16 355 95000 1100 132 100
180 x 235 132 146 162 M 16 355 115000 1200 144 110
190 x 250 132 146 162 M 16 355 121500 1200 132 100
200 x 260 132 146 162 M 16 355 128000 1200 130 100
220 x 285 132 146 162 M 16 355 140500 1200 117 90
240 x 305 132 146 162 M 16 355 210000 1500 140 110
260 x 325 134 148 164 M 16 355 255000 196 225 180
280 x 355 165 177 197 M 20 690 368000 262 241 190
300 x 375 165 177 197 M 20 690 430000 292 244 195
Recommended shaft/hub fitting tolerances h8/H8
Further information is available at www.maschinenlager.de

Walther Flender Gruppe
Clamping sets Page 41
Taper Lock® clamping bushes
In addition to the cylindrical clamping elements listed here, we also offer an extensive line of conical TL clamping elements.
Installation
Clean and degrease all exposed
surfaces. Fit pulley and bush, align
holes and screw in screws loosely.
Push pulley with bush onto the
shaft, align and tighten screws
evenly to the correct torque according
to the table.
The empty bores should be filled
with grease to prevent penetration
by foreign objects.
1008 to 3030
Disassembly
Remove screws, insert one as a pushoff
screw into the hole with a half
thread in the bush and tighten.
This loosens the Taper Lock® bush.
Remove the loosened pulley unit
– without impact to prevent
damage to the machine – by hand.
3525 to 5050
If high torques have to be transmitted and no feather key is used,
the Taper Lock® clamping bush can be driven further into the conical
bore by lightly tapping with a hammer, using a suitable sleeve
or wooden block. Afterwards, the screws can be tightened a bit
more. This procedure can be repeated.
* The specified slipping torques were measured on test stands.
The screws were tightened to the corresponding torque.
Taper Lock® is a trademark of J. H. Fenner and Co. Ltd.
Mounting bores
Disassembly bores
008 1108 1210 1610 1615 2012 2517 3020 3030 Model 3525 3535 4030 4040 4535 4545 5040 5050
5.6 5.6 20 20 20 30 50 90 90 Torque [Nm] 115 115 170 170 190 190 270 270
2 2 2 2 2 2 2 2 2 Number of screws 3 3 3 3 3 3 3 3
1/4“ 1/4“ 3/8“ 3/8“ 3/8“ 7/16“ 1/2“ 5/8“ 5/8“ Screw ø (inches) 1/2“ 1/2“ 5/8“ 5/8“ 3/4“ 3/4“ 7/8“ 7/8“
3 3 5 5 5 6 6 8 8 Hexagon SLW (mm) 10 10 12 12 14 14 14 14
Taper Lock®
clamping bush
1008
1108
1210
1610
+
1615
2012
2517
Bush bore
(mm)
Slipping torque
(Nm*)
Clamping force
N
12 29 3990
19 51 4940
24 66 5490
12 28 –
19 49 4630
24 64 5220
28 79 5720
16 82 8840
19 105 9800
24 142 10900
32 210 12300
19 98 –
24 135 9570
38 240 11900
42 265 12700
24 165 11500
38 310 14400
42 340 15700
48 400 –
50 420 16700
24 220 –
38 380 17000
42 430 18500
48 510 –
55 600 21000
60 670 22300
Taper Lock®
clamping bush
3020
+
3030
3525
+
3535
4030
+
4040
4535
+
4545
5040
+
5050
Bush bore Slipping torque Clamping force
(mm)
(Nm*)
N
38 520 23900
48 730 26100
55 890 29900
60 970 31500
75 1300 34500
42 1000 41000
60 1580 49800
75 2150 54800
90 2600 59000
48 1700 –
60 2300 70200
75 3150 77200
100 4400 89400
55 2500 79600
75 3900 93000
100 5500 107700
110 6300 –
75 3950 91800
100 5650 106600
125 7370 119500

Walther Flender Gruppe
Clamping sets Page 42
Taper Lock® clamping bushes
Bush
no.
1008
1108
1210
1310
1610
1615
2012
2517
3020
3030
Bush bore
mm
10
11 12
14 16
18 19 20 22
24 25
10
11 12
14 16
18 19 20 22
24 25
28
11 12
14 16
18 19 20 22
24 25 28 30
32
14 16
18 19 20 22
24 25 28 30
32
35
14 15 16
18 19 20 22
24 25 28 30
32 35 38
40 42
14 16
18 19 20 22
24 25 28 30
32 35 38
40 42
14 16
18 19 20 22
24 25 28 30
32 35 38
40 42
45 48 50
16
18 19 20 22
24 25 28 30
32 35 38
40 42
45 48 50
55
60
25 28 30
32 35 38
40 42
45 48 50
55
60 65
70 75
35 38
40 42
45 48 50
55
60 65
70 75
* Bore with flat groove
Keyway
mm
wide deep
3
4
5
6
8
3
4
5
6
8
8
4
5
6
8
10
5
6
8
10
10
5
6
8
10
12
5
6
8
10
12
5
6
8
10
12
14
5
6
8
10
12
14
16
18
8
10
12
14
16
18
20
10
12
14
16
18
20
4 hole 5 hole
1.4
1.8
2.3
2.8
1.3*
1.4
1.8
2.3
2.8
3.3
1.3*
1.8
2.3
2.8
3.3
3.3
2.3
2.8
3.3
3.3
1.3*
2.3
2.8
3.3
3.3
3.3
2.3
2.8
3.3
3.3
1.3*
2.3
2.8
3.3
3.3
3.3
3.8
2.3
2.8
3.3
3.3
3.3
3.8
4.3
4.4
3.3
3.3
3.3
3.8
4.3
4.3
4.9
3.3
3.3
3.8
4.3
4.4
4.9
Bush
length
mm
22.3
22.3
25.4
25.4
25.4
38.1
31.8
44.5
50.8
76.2
Approx.
weight
kg
0.15
to
0.08
0.18
to
0.10
0.17
to
0.30
0.19
to
0.33
0.42
to
0.20
0.60
to
0.25
0.80
to
0.38
1.7
to
0.80
2.8
to
1.5
4.0
to
2.1
Largest
diameter
mm
35
38
47.5
51
57
57
70
85.5
108
108
Bush
no.
Bush bore
mm
Keyway
mm
wide deep
Bush
length
mm
Approx.
weight
kg
Largest
diameter
mm
35 38 10 3.3
5.5
40 42 12 3.3
45 48 50 14 3.8
55 16 4.3
3525 60 65 18 4.4 64 to 127
70 75 20 4.9
80 85 22 5.4
90 95 25 5.4
100 28 4.4* 1.8
35 38 10 3.3
6.6
40 42 12 3.3
45 48 50 14 3.8
3535
55
60 65
16
18
4.3
4.4
88.9
to
127
70 75 20 4.9
80 85 22 5.4
90 25 5.4 3.2
40 42 12 3.3
7.4
45 48 50 14 3.8
55 16 4.3
60 65 18 4.4
4030 70 75 20 4.9 76 to 146
80 85 22 5.4
90 95 25 5.4
100 105 110 28 6.4
115 32 5.4* 4.2
40 42 12 3.3
10.1
45 48 50 14 3.8
55 16 4.3
4040
60 65
70 75
18
20
4.4
4.9
101.6
to
146
80 85 22 5.4
90 95 25 5.4
100 28 6.4 5.2
55 16 4.3
10.7
60 65 18 4.4
70 75 20 4.9
4535 80 85 22 5.4 89 to 162
90 95 25 5.4
100 105 110 28 6.4
115 120 125 32 7.4 4.2
55 16 4.3
13.2
60 65 18 4.4
4545
70 75
80 85
20
22
4.9
5.4
114.3
to
162
90 95 25 5.4
100 105 110 28 6.4 7.4
70 75 20 4.9
12.2
80 85 22 5.4
5040 90 95 25 5.4 102 to 178
100 105 110 28 6.4
115 120 125 32 7.4 6.2
70 75 20 4.9
15.2
80 85 22 5.4
5050 90 95 25 5.4 127 to 178
100 105 110 28 6.4
115 120 125 32 7.4 9.2

Walther Flender Gruppe
Clamping sets Page 43
Causes of malfunctions
Fault Cause Solution
Excessive noise levels Misalignment of pulleys
Excessive belt tension
Overload of drive system
Worn timing belt pulley
Incorrect pulley profile
Rim flange stop face too large
Air displacement in hollows
Visible belt elongation Reduction of centre distance of axes due to loosening of
the shaft bearings or timing belt pulley mounting
Pulley wear (outer diameter)
Overload of drive system
Heat-up and subsequent cooling of drive system
Excessive change in the timing belt material
(melting, softening)
Belt runs off to side Belt runs off the side of the timing belt pulley
Excessive wear on side of belt
Loosening of rim flanges Misalignment of pulleys, resulting in excessive axial forces Align pulleys
Excessive wear on side
of belt
Incorrect axis parallelism or change in the centre
distance of axes due to insufficient strength of
bearings and axles
Rim flanges defective or not bevelled
Damage due to incorrect handling
Timing belt too wide
Premature tooth wear Initial tension too high or too low
Belt runs off over rim flange
Incorrect belt profile for timing belt pulley
Worn timing belt pulley
Timing belt pulley surface too rough
Overload
Excessive damage due to foreign objects
Shearing of belt teeth Not enough teeth meshing
Overload of drive system
Worn timing belt pulley
Incorrect belt profile for timing belt pulley
Insufficient belt tension
Extreme shock loads
Broken belt Timing belt pulley diameter too small
Overload of drive system
Foreign objects
Incorrect handling of timing belt during installation,
belt damaged from kinking or bending
Abnormal wear of
timing belt pulley (outer
diameter or tooth flanks)
Increased belt tension or overload
of drive system
Timing belt pulley diameter too small
Incorrect profile
Foreign objects
Cracks in tooth back Temperature too low
Temperature too high
Aggressive chemicals
Increased temperature Initial tension too high or too low
Incorrect timing belt profile or timing belt pulley profile
Outer diameter too large
Vibrations Initial tension too high or too low
Loose timing belt pulley
Vibrations in the slack side
Align pulleys
Reduce initial tension
Increase belt width
Replace timing belt pulley
Correct profile
Use of standard rim flanges with bending radius
Custom profile
Reset centre distance of axes and reinforce mounting
Replace timing belt pulley
Redesign drive system
Check thermal expansion coefficient and use other
materials, if necessary
Reduce temperatures to permissible range
Align drive system correctly
Align drive system correctly
Check axis parallelism and/or increase strength
of axles and bearings
Align or replace rim flanges
Follow procedure in assembly instructions
Use timing belt pulleys with correct width
Correct initial tension
Align timing belt pulley/correct initial tension
Use PolyChain® timing belt pulleys
Replace timing belt pulley
Replace timing belt pulley
System must be redesigned
Timing belt cover
Increase number of pulley teeth or use
smaller pitch
Increase belt width
Replace timing belt pulley
Use correct tooth profile
Set correct belt tension
System must be redesigned
Increase pulley diameter or belt power output
Use wider timing belt
Protective drive cover
Comply with installation instructions
Reduce initial tension or increase belt width;
redesign system, if necessary
Use correct timing belt pulleys
Use correct drive system
Protective drive cover
Avoid low temperatures
Avoid high temperatures
Protective drive cover
Set correct initial belt tension
Use correct drive system
Correct outer diameter
Set correct initial belt tension
Re-attach timing belt pulleys and mount according to
specifications
Install a tangential tension pulley

Walther Flender Gruppe
Clamping sets Page 44
Product overview
WF timing belt drive systems
WF timing belts are available in 5 basic systems for diverse transmission requirements.
The powerful PowerGrip® GT3 and PolyChain belt systems ensure compact power density
with high cost effectiveness.
Shaped belts and flex belts in fixed lengths of your choice or as polyurethane metre ware
in a wide range of pitches are available as an ideal transmission solution for almost all
transport and conveyor requirements. These timing belts can additionally be supplied
with cams or various coatings on the reverse.
Special range of WF timing belt pulleys
Special builds of timing belt pulleys based on customer drawings can be produced on the
most modern manufacturing machinery. A wide selection of materials and moulded parts
in plastic, sintered materials, or die-cast complete the range for series applications.
WF shaft couplings
Various ranges of shaft couplings in torsion-proof or torsionally flexible versions are
available for a multiplicity of applications.
WF drive assemblies
Supported by 3D CAD systems and their corresponding calculation software, Walther
Flender Antriebstechnik develops and supplies complete assemblies for diverse drive
technology requirements. At the request of the customer, existing designs are optimised
in terms of technology and efficiency. An example of this is the unit shown adjacent,
which conveys paper webs.
WF conveyor rollers
Walther Flender Antriebstechnik designs and builds conveyor rollers for heavy weights
especially for skid transport in the automotive industry. Two models are shown as
examples (driven on one and both sides).
WF transmissions
The WF range of transmissions includes worm gears, straight bevel and cylindrical gears
and right angled gears for high torques up to 1,000,000 Nm. All types are available in
a practical range of sizes, with or without motors.

Walther Flender Gruppe
Clamping sets Page 45
Project data sheet
Data sheet for calculating
Walther Flender GmbH
Postfach 13 02 80
Schwarzer Weg 100 –107
40593 Düsseldorf
Fax: +49.(0)211.70 07-339
E-Mail: info@walther-flender.de
Application:
Existing drive system with
to be replaced by
Drive data:
Type
Belt drive systems
Company
Name / Department
Street / P.O. Box
Zip code / City
Phone
Fax
E-mail
yes no Requirement Quantity/year
Driving machine
(e.g. electric motor)
Make
Model
Working machine
(e.g. machine tool)
Speed n 1 min -1 n 2 min -1
Power output P kW P kW P max kW
Torque Braking torque Nm Starting torque Nm
Starting characteristics
(e.g. torque flow, starting type)
Type of load
uniform
non-uniform
alternating
reversing
Pulley diameter Pitch diameter d w1 mm Pitch diameter d w2 mm
Permissible diameter range
Max. permissible pulley width
Outer diameter d a1 mm Outer diameter d a2 mm
from mm to mm from mm to mm
mm mm
Transmission ratio i i min i max to step-down step-up
Existing centre distance of axes a mm Centre distance adjustment range mm fixed
Centre distance of axes range (for new design) a min mm a max mm
Idlers / guide pulleys inner pulley load side
outer pulley lostum
Pulley diameter d w mm d a mm
Shaft arrangement horizontal vertical
Operating conditions:
Chemical influences (e.g. oil, dust, etc.)
Ambient temperature °C
Daily operating hours hours/day Number of times switched on / off daily
Desired noise level dBA

Notizen

Notizen

Walther Flender Gruppe
Schwarzer Weg 100–107
40593 Düsseldorf
Deutschland
Tel. : +49.(0)211.70 07- 00
Fax: +49.(0)211.70 07-227
E-Mail: info@walther-flender.de
www.walther-flender-gruppe.de
PolCha_en_Nov_09