Bearing Selection Guide

Download Angular Bearing Selection Guide

The following table explains the breakdown of each portion of a product number. The angular contact bearing product number structure is derived from different components. Below shows what each section means.

HY
1
KH
2
A
3
6002
4
-2RZ
5
C
6
TA
7
P4
8
R
9
X
10
D
11
UL
12
S1
13
-L252
14
1 Material
- Bearings made of bearing steel have no prefix
M Bearings made of high temperature steel1
N Bearings made from high nitrogen steel1
HY Balls made of Silicon Nitride, rings made of bearing steel
2 Series
S Standard bearing series, single relief on outer ring
SM High speed large ball series, similar but higher speed to S series
KH Small ball high speed series, with optional seals
BNT Separable bearing, similar to S series performance
BHT Separable bearing, similar to SM series performance
3 Direct Lubrication
- Standard
A Oil lubrication hole through outer ring on open side
AB Oil lubrication hole through outer ring on closed side
L Oil lubrication hole through outer ring on open side, outer ring oil groove with O-ring seals
LB Oil lubrication hole through outer ring on closed side, outer ring oil groove with O-ring seals
AG Grease lubrication hole through outer ring on open side
4 Bearing Size
6002 Designation of dimensions series and bore diameter
5 Seals
2RZ Seals on both sides (For KH series)
6 Contact Angle
C 15°
E 25°
18° Custom Contact Angle
7 Cage
TA Laminated phenolic resin cage guided on outer ring (standard)
TXM Molded plastic cage guided on outer ring, ball retaining2
8 Precision
P4 European tolerance class P4 corresponds to P4S per DIN 628-6, similar to ABEC 73
P2 European tolerance class, similar to ABEC 93
A7 ABEC 7 per ABMA standards, similar to P43
A9 ABEC 9 per ABMA standards, similar to P23
HG GMN high precision according to GMN specification, higher than P4, but lower than UP3
UP GMN ultra precision according to GMN specification, higher than HG, but lower than P23
9 High Point Marking
R High point mark for radial runout for both inner and outer rings
Ri Similar to R, but only for inner ring
Ra Similar to R, but only for outer ring
10 Grading
X Grading of bore and outer diameter4
11 Bearing Sets
- 1 bearing
D 2 bearings
T 3 bearings
Q 4 bearings
12 Matching and Preload
UL Universal matching - light preload
UM Universal matching - medium preload
US Universal matching - heavy preload
UV Universal matching - special preload
DF Face-to-Face arrangement
DB Back-to-Back arrangement
DT Tandem arrangement
13 Heat Treatment
S1 Operating temperature up to 200 °C1
S2 Operating temperature up to 250 °C1
S3 Operating temperature up to 300 °C1
14 Lubrication
- No lubrication
L252 Lubrication identifier, ex. Turmogrease HS L252

1. Available on request
2. Other cages available on request
3. Exact specifications can be found in the GMN Ball Bearing Catalog
4. For more information, please contact GMN USA engineers


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