Bearing knowledge: bearing front and rear code and its meaning

FAG bearing pre-code (prefix) and its meaning R is placed directly before the bearing basic code, and the rest of the pre-code is separated from the basic code by a small dot.

GS—Thrust cylindrical roller bearing race. Example: GS.81112

K–-The combination of rolling elements and cages. Example: K.81108 assembly of thrust cylindrical roller and cage.

FAG bearing rear code (suffix) and its meaning

F-steel solid cage, guided by rolling elements.

FA-steel solid cage with outer ring guide.

FAS-steel solid cage with outer ring guide and lubrication groove.

FB-steel solid cage with inner ring guide.

FBS-steel solid cage with inner ring guide and lubrication groove.

FH-steel solid cage, carburized and quenched.

H, H1-carburized quenching cage.

The P5-tolerance level is in accordance with the international standard ISO level 5.

The P4-tolerance level is in accordance with the international standard ISO level 4.

P2-tolerance level conforms to international standard ISO level 2 (excluding tapered roller bearings)

NSK bearing pre-code meaning

F—— Deep groove ball bearing of flange outer ring (applicable to d less than 10 mm), for example: F605.

HR - High load tapered roller bearings, for example: HR30207J.

NSK bearing rear code meaning

A - Bearings with different internal design and standard.

A - angular contact ball bearing, contact angle is 30 degrees.

A5 - angular contact ball bearing, contact angle is 25 degrees

Z, ZS - with a steel dust cover on one side.

ZZ, ZZS - with steel dust cover on both sides.

D, DU - one side with a contact rubber seal.

C1—The radial clearance of the radial bearing is smaller than the C2 clearance.

C2—The radial clearance of the radial bearing is smaller than the standard clearance.

CN (omitted) & mdash, bearing; - radial standard clearance of radial bearing.

C3—The radial clearance of the radial bearing is larger than the standard clearance.

C4—The radial clearance of the radial bearing is larger than the C3 clearance.

NTN bearing suffix meaning

B——40° contact angle;

TIMKEN bearing suffix meaning

AB outer ring with flanged outer ring, not interchangeable with basic model

AC inner ring with different inner diameter and rounded outer diameter, different internal geometry

OD/width/or fillet radius of the outer ring different from the basic model

AD outer ring double outer ring, not interchangeable with basic model

CR inner/outer ring outer raceway with rib bearing series

CX inner ring size is different from basic model and is not interchangeable

D inner/outer ring double inner ring or double outer ring, not interchangeable with basic model

INA bearing suffix meaning

P-bearing with seal ring on one side

PP-bearing with sealing ring on both sides

RS-bearing with seal on one side

2RS-bearing with sealing ring on both sides

P6 - Bearings with higher dimensional tolerances and geometric accuracy

P5-bearings with high dimensional tolerances and geometric accuracy

P4-bearings with extremely high dimensional tolerances and geometrical accuracy

KOYO bearing front code meaning

4CRI-four row cylindrical roller bearing inner ring, for example: 4CRI4560F

4CRO-four row cylindrical roller bearing outer ring, for example: 4CRO660AF

E-magnet ball bearings, the outer diameter is positive tolerance, for example: E10

EN-Magnetic ball bearings, outer diameter is negative tolerance, for example: EN10

KOYO bearing suffix meaning

A-angle contact bearing, contact angle 30 degrees (not marked), for example: 7210

B-angle contact bearing, contact angle 40 degrees, for example: 7210B

C-angular contact bearing, contact angle 15 degrees, for example: 7210C

RSC-silicone rubber RS ​​seal, for example: 6210RSC

RSD-polypropylene rubber RS ​​seal, for example: 6210RSD

RSE-single-sided, rib-guided contact-type synthetic rubber seal, for example: 6206RSE

K-with tapered bearing, taper 1:12, for example: 1210K

K30-with tapered bearing, taper 1:30, for example: 23026K30

N-outer ring with stop groove bearing,

C-tapered roller bearing with keyhole

NR-outer ring with snap ring bearing, for example: 6210NR

Y-non-standard chamfer smaller than the standard chamfer size, for example: 30206Y

S-tapered roller bearings, non-standard chamfering (inclination)

SG-inner diameter tapered roller bearing with spiral groove


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