Bearing Prefix and Suffix Manual
Rolling bearing numbers indicate bearing type, dimensions, tolerances, internal structure, and other related specifications. Usually bearing numbers are comprised of a “basic number” followed by “supplementary codes.”
The basic bearing number tells general information about a bearing, such as its fundamental type, series number, bore diameter code and contact angle. The supplementary codes derive from prefixes and suffixes which indicate a bearing’s tolerance, internal clearance, cage type,and other specifications.
This is a bearing code classification manual, hope to help you identify and choose the right bearing.
Tolerance Class(Dimension and rotation accuracy) by ISO:
P0→P6→P5→P4→P2(tapered roller bearings are not included in P2 standard)
SP(double row cylindrical roller bearings): Dimension accuracy: class 5 /Rotation accuracy: class 4
UP(double row cylindrical roller bearings): Dimension accuracy: class 4 /Rotation accuracy: class 4
HG(spindle bearing):Dimension accuracy: class 4 /Rotation accuracy: class 4,lower than class 2
Deep Groove Ball Bearing
| Bearing Type | Bearing Series |
| Single Row | 68,69,160,60,62,63,64,622,623 |
| Double Row | 42,43 |
| Prefix： | Suffix： | Suffix： |
| S: Stainless steel material | CN:Normal clearance | M: Machined brass cage |
| F:Flanged outer ring | C2: Radial clearance less than normal | N:With snap ring groove |
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| C3:Radial clearance higher than normal | NR:Snap ring groove with snap ring |
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| C4:Radial clearance higher than C3 | ZRN：With one side metal shield and snap ring groove with snap ring |
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| CM: Electric motor clearance | Z: With one side metal shield |
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| DDU: Bearings with non contact type rubber seals | ZZ: With both sides metal shield |
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| LLU: Bearings with contact type rubber seals | 2RSR：With both sides seals |
Angular Contact Ball Bearing
| Bearing Type | Bearing series |
| Single row angular contact ball bearings | 72,73 |
| Double row angular contact ball bearing with filling slot (maximum capacity) | 32,33 |
| Double row angular contact ball bearing without filling slot | 52,53 |
| Prefix： | Suffix: |
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| A: 30 degree contact angle B: 40 degree contact angle C:15 degree contact angle E:25 degree contact angle TVP:With reinforced polyamide cage M:Brass cage |
Self-Aligning Ball Bearing
| Bearing Type | Bearing series |
| Self-Aligning ball bearing | 12,22,13,23 |
| Prefix： | Suffix: |
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| K:With tapered bore H:With adapter sleeve |
Cylindrical Roller Bearing
| Bearing Type | Bearing series |
| Single row | 2,22,3,32,SL18..18,SL18..29,SL18..30 SL19..23 |
| Double row | NN30,SL01..48,SL02..49,SL04..PP, SL18..50 |
| Four row | FC |
| Cylindrical roller bearing without outer rings | RSL,F series(CPM) |
| Prefix: | Suffix: |
| N: with two fixed ribs on the inner ring that retain the rollers and cage and one smooth outer ring | N:With snap ring groove |
| NJ: with two fixed ribs on the outer ring and a fixed rib on the inner ring which can guide the shaft in a single direction (axially) | NR:Snap ring groove and snap ring |
| NU：with two fixed ribs on the outer ring and one smooth inner ring. | V:Full compliment bearings |
| NUP：with two fixed ribs on the outer ring and, on the inner ring, a fixed rib and a support washer | E:extra capacity design |
| NF：with two integral ribs on the inner ring and a single rib on the outer ring. | M:brass cage |
| NNU: with three fixed ribs on the outer ring and one smooth inner ring. |
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Spherical Roller Bearing
| Bearing Type | Bearing series |
| Spherical roller bearing | 230,240,231,241,222,232,213,223,239 |
| Prefix: | Suffix: |
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| CC: Steel cage |
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| CA: Machined single brass cage |
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| M: Machined brass cage |
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| MA: Machined brass cage outer ring guided |
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| MB: Machined brass cage inner ring guided |
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| K: Tapered bore 1:12/K30:Tapered bore 1:30 |
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| W33 :Lubricating holes and groove on outer ring |
Tapered Roller Bearings
| Bearing Type | Bearing series |
| Taper roller bearing | 320,330,331,302,322,332,303,313,323 |
| Prefix: | Suffix: |
| HR: High load taring(NSK) | D: Steep contact angel (24°~32°) metric series |
| HM:Heavy medium duty inch series | JR: High load carrying capacity |
| JL:J series tapper roller bearings | J: with contact angle as per ISO(NSK) |
| JLM:J series light medium duty inch series |
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| L:Light duty inch series |
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| LM:Light medium duty inch series |
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| M:Medium duty inch series |
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Thrust Ball/Roller Bearing
| Bearing Type | Bearing series |
| Thrust ball/roller bearing | 511,512,513,29, |
| Prefix: | Suffix: |
| WS:shaft washer | M:Machined brass cage |
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