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86 KRW
Roller bearing specification
Suffix letter codes
The suffix letter codes are based upon standard DIN 623 and have the following meaning:
Cage
M Machined brass cage Example NU1064E.MA
F Machined steel cage Example 24.60.01FPA
AL Machined aluminium cage 1)
F Machined steel cage Example 24.60.01
1)
Example 81120ALB
H Machined bronze cage Example NU1044HPA
T Machined laminated plastic cage Example 7220B.TB
TN Polyamide cage Example 6020TN
1)
AL differs from DIN 623, which says L.
Other numbers and letters specify in the tables
Dimension, design and position tolerances:
PN Standard tolerances (not special code)
P6 Tolerance class P6, more precise than PN Example 6040M.P6
P5 Tolerance class , more precise than P6 Example NU320E.M.P5
P4 Tolerance class P4, more precise than P5 Example NNU4920M.P4
Bearing clearance :
C1 Smaller than C2 (normally, only with
rings of double-row cylindrical roller bearings
which cannot be replaced) Example NNU4932M.C1NA
C2 Smaller than CN Example NU240E.M3.C2
CN Standard clearance (normally, no special code)
C3 Larger than CN Example 61844M.C3
C4 Larger than C3 Example NJ2340E.M2.C4
C5 Larger than C4 (used only with spherical roller bearings)
Precision and bearing clearance are often specified using
combined codes. Example 6240M.P63
Example: P63 has tolerance class P6 and bearing clearance C3
Dimension stabilization
SN Designed for maximum operating temperatures of 120 °C
S0 Designed for maximum operating temperatures of 150 °C Example NU224E.M.C3.SO
S1 Designed for maximum operating temperatures of 200 °C Example 71996MP.S1
S2 Designed for maximum operating temperatures of 250 °C Example 236M.C3.S2
S3 Designed for maximum operating temperatures of 300 °C Example NU240E.M3A.C3.S3
S4 Designed for maximum operating temperatures of 350 °C Example 24032EAS.C4.S4
Additional codes
Additional codes are normally agreed with the customer and may be used if a tailored works specification is applied.
FV1 Bearing manufacted by instructions for manufactoring of KRW Example NU328E.M.FV1
Roller bearings that are not included in the product standards and are manufactured according to customer specifications
get a drawing number, in which the bearing design, diameter and the modification are shown clearly.
E. g. 12.54.01 heavy, multi-row cylindrical roller bearing with pin cage, roller bearing rings and roll body with special
heat treatment.
The design of the bearings and the production are carried out according to all the applicable standards and technical
specifications, which apply to standard range roller bearings; if required, additionally according to special customer
requirements.
The drawing number for the special bearings applies internally for all production documents and is generally agreed
with the customer, so that subsequent supplies are possible at all times.