Timken Super Precision Bearings for Machine Tool Applications

Width Tolerances
The width tolerances for individual inner and outer rings are shown
in the tables below. To allow for the preload grinding on bearings
for various preloads, the total width tolerances of duplex sets are
as shown in the table to the right. The total width tolerance is
proportional to the number of bearings. Note the Timken values are
significantly tighter than ABMA/ISO requirements.
ENGINEERING
Nominal bore
Width tolerance
(duplex set)
ABMA/ISO
Timken
Over Incl. Max. Min. Max. Min.
mm
in.
mm
in.
mm
in.
0.000 80.000 0.000 -0.500 0.000 -0.250
0.0000 3.1496 0.0000 -0.0196 0.0000 -0.0100
80.000 180.000 0.000 -0.760 0.000 -0.250
3.1496 7.0866 0.0000 -0.0300 0.0000 -0.0100
180.000 250.000 0.000 -1.000 0.000 -0.250
7.0866 9.8425 0.0000 -0.0394 0.0000 -0.0100
mm
in.
Table 18. Preloaded duplex set width tolerance.
mm
in.
mm
in.
A
Bearing O.D.
Δ Dmp
Outside diameter (1)
+0.000 mm, +0.0000 in.
Standard ABEC/ISO tolerances – outer ring
All tolerances in number of millimeters (mm) and inches (in.)
V Cs
Width
variation
K ea
Raceway
radial runout
S ea
Raceway
axial runout
S D
Face runout
with O.D.
Δ Cs
Width
outer rings
+0.000 mm,
+0.0000 in.
ABEC/ISO ABEC/ISO ABEC/ISO ABEC/ISO ABEC/ISO ABEC/ISO
Over Incl. 5/P5 7/P4 9/P2 5/P5 7/P4 9/P2 5/P5 7/P4 9/P2 5/P5 7/P4 9/P2 5/P5 7/P4 9/P2
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
6.000 18.000 -0.005 -0.004 -0.0025 0.005 0.0025 0.015 0.005 0.003 0.0015 0.008 0.005 0.0015 0.008 0.004 0.0015
0.2362 0.7087 -0.0002 -0.00015 -0.0001 0.0002 0.0001 0.00005 0.0002 0.0001 0.00005 0.0003 0.0002 0.00005 0.0003 0.00015 0.00005
18.000 30.000 -0.006 -0.005 -0.004 0.005 0.0025 0.015 0.006 0.004 0.0025 0.008 0.005 0.0025 0.008 0.004 0.0015
0.7087 1.1811 -0.00025 -0.0002 -0.00015 0.0002 0.0001 0.00005 0.00025 0.00015 0.0001 0.0003 0.0002 0.0001 0.0003 0.00015 0.00005
30.000 50.000 -0.007 -0.006 -0.004 0.005 0.0025 0.015 0.007 0.005 0.0025 0.008 0.005 0.0025 0.008 0.004 0.0015
1.1811 1.9685 -0.0003 -0.0002 -0.00015 0.0002 0.0001 0.00005 0.0003 0.0002 0.0001 0.0003 0.0002 0.0001 0.0003 0.00015 0.00005
50.000 80.000 -0.009 -0.007 -0.004 0.006 0.003 0.015 0.008 0.005 0.004 0.010 0.005 0.004 0.008 0.004 0.0015
1.9685 3.1496 -0.00035 -0.0003 -0.00015 0.00025 0.0001 0.00005 0.0003 0.0002 0.00015 0.0004 0.0002 0.00015 0.0003 0.00015 0.00005
80.000 120.000 -0.010 -0.008 -0.005 0.008 0.004 0.0025 0.010 0.006 0.005 0.011 0.006 0.005 0.009 0.005 0.0025
3.1496 4.7244 -0.0004 -0.0003 -0.0002 0.0003 0.00015 0.0001 0.0004 0.00025 0.0002 0.00045 0.00025 0.0002 0.00035 0.0002 0.0001
120.000 150.000 -0.011 -0.009 -0.005 0.008 0.005 0.0025 0.011 0.007 0.005 0.013 0.007 0.005 0.010 0.005 0.0025
4.7244 5.9055 -0.00045 -0.00035 -0.0002 0.0003 0.0002 0.0001 0.00045 0.0003 0.0002 0.0005 0.0003 0.0002 0.0004 0.0002 0.0001
150.000 180.000 -0.013 -0.010 -0.007 0.008 0.005 0.0025 0.013 0.008 0.005 0.014 0.008 0.005 0.010 0.005 0.0025
5.9055 7.0866 -0.0005 -0.0004 -0.0003 0.0003 0.0002 0.0001 0.0005 0.0003 0.0002 0.00055 0.0003 0.0002 0.0004 0.0002 0.0001
180.000 250.000 -0.015 -0.011 -0.008 0.010 0.007 0.004 0.015 0.010 0.007 0.015 0.010 0.007 0.011 0.007 0.004
7.0866 9.8425 -0.0006 -0.00045 -0.0003 0.0004 0.0003 0.00015 0.0006 0.0004 0.0003 0.0006 0.0004 0.0003 0.00045 0.0003 0.00015
250.000 315.000 -0.018 -0.013 -0.008 0.011 0.007 0.005 0.018 0.011 0.007 0.018 0.010 0.007 0.013 0.008 0.005
9.8425 12.4016 -0.0007 -0.0005 -0.0003 0.00045 0.0003 0.0002 0.0007 0.00045 0.0003 0.0007 0.0004 0.0003 0.0005 0.0003 0.0002
315.000 400.000 -0.020 -0.015 -0.010 0.013 0.008 0.007 0.020 0.013 0.008 0.020 0.013 0.008 0.013 0.010 0.007
12.4016 15.7480 -0.0008 -0.0006 -0.0004 0.0005 0.0003 0.0003 0.0008 0.0005 0.0003 0.0008 0.0005 0.0003 0.0005 0.0004 0.0003
5/P5, 7/P4,
9/P2
The tolerances in this table are in conformance with ANSI ABMA Standard 20 - 1996.
(1) D min (the smallest single diameter of an O.D.) and D max (the largest single diameter of an O.D.) may fall outside limits shown. Dmin + Dmax must be within outside diameter tabulated.
(2)Identical to Δ Bs of inner ring of same bearing.
2
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
(2)
ABMA ⁄ ISO Symbols - Outer Ring
Dmp Single plane mean outside diameter deviation from basic
outside diameter, e.g., O.D. tolerance
K ea Radial runout of assembled bearing outer ring, e.g., radial
runout of raceway
V Cs Outer ring width variation, e.g., parallelism
S D Outer ring reference face runout with O.D., e.g., squareness
O.D. to face
S ea Axial runout of assembled bearing outer ring, e.g., lateral
(axial) runout of raceway
Cs Outer ring width deviation from basic, e.g., width tolerance
TIMKEN MACHINE TOOL CATALOG 79