Nk1232

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.”

Nk2721

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:   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:   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.         Spherical Roller Bearing  Bearing Type Bearing series Spherical roller bearing 230,240,231,241,222,232,213,223,239   Prefix: Suffix:   CC: Steel cage   CA: Machined single brass cage   M: Machined brass cage   MA: Machined brass cage outer ring guided   MB: Machined brass cage inner ring guided   K: Tapered bore 1:12/K30:Tapered bore 1:30   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   L:Light duty inch series   LM:Light medium duty inch series   M:Medium duty inch series     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

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   C3:Radial clearance higher than normal NR:Snap ring groove with snap ring   C4:Radial clearance higher than C3 ZRN：With one side metal shield and snap ring groove with snap ring   CM: Electric motor clearance Z: With one side metal shield   DDU: Bearings with non contact type rubber seals ZZ: With both sides metal shield   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:   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:   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.         Spherical Roller Bearing  Bearing Type Bearing series Spherical roller bearing 230,240,231,241,222,232,213,223,239   Prefix: Suffix:   CC: Steel cage   CA: Machined single brass cage   M: Machined brass cage   MA: Machined brass cage outer ring guided   MB: Machined brass cage inner ring guided   K: Tapered bore 1:12/K30:Tapered bore 1:30   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   L:Light duty inch series   LM:Light medium duty inch series   M:Medium duty inch series     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

Nk1078

NK77

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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)

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.