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How to identify SKF bearings cross reference and interchange

A leading bearing manufacturer

Founded in 1907 SKF has built a reputation unrivaled in the bearing industry. By 1910 the company expanded from its Swedish routes. This rapid growth continued even further as by 1930 SKF employed over 21,000 staff and had 12 manufacturing facilities across the globe. Currently, SKF employs over 44,000 and manufactures in over 100 sites spanning 70 countries, resulting in SKF being the largest bearing manufacturer in the world. Some SKF customers include Rolls Royce, General Electric, and Mercedes Benz. Offering an enormous range of bearings and related engineering components SKF can provide a solution for every engineering process.

SKF single row deep groove ball bearings interchange

Deep groove ball bearings Part NumberThin section618xx618xx68xx68xx618xx
With filling slots2xx


Deep groove ball bearings Part Number SuffixContact seal, on one or both sidesRS1, 2RS1RSR, 2RSRDU, DDULU, LLURS, 2RS
Contact seal, on one or both sidesRSH, 2RSHRSR, 2RSRDU, DDULU, LLURS, 2RS
Low-friction seal, on one or both sidesRSL, 2RSL  LH, LLH 
Non-contact seal, on one or both sidesRZ, 2RZBRS, 2BRSV, VVLB, LLBRZ, 2RZ
Shield on one or both sidesZ, 2ZZ, 2ZZ, ZZZ, ZZZ, ZZ
Snap ring grooveNNNNN


SKF angular contact ball bearings interchange 

Single row angular contact ball bearingsLight72xxB72xxB72xxB72xxB72xxWN
Double row angular contact ball bearingsLight32xxA32xx52xx52xx52xx
Part Number Suffix40° contact angleBBBBWN
30° contact angleA AA 
25° contact angleAC A5  
Non-contact seal-2RZ2RS LLM 
Contact seal-2RS12RSR LLD 
Shield on both sides-2Z2Z ZZDD 



SKF self-aligning ball bearings interchange 

Part numberExtra narrow12xx12xx12xx12xxS
Part Number SuffixTapered boreKKKK
Contact seal-2RS12RS  



SKF cylindrical roller bearings interchange 

Cylindrical roller bearings


have two integral flanges on the outer ring and no flanges on the inner ringNUNUNUNU
have two integral flanges on the inner ring and no flanges on the outer ringNNNN
have two integral flanges on the outer ring and one on the inner ringNJNJNJNJ
have two integral flanges on the outer ring and one integral flange and one non-integral flangeNUPNUPNUPNUP
Inch bearingsCRL


High-capacityNCFSL18 NCF
Double rowNNUNNUNNU 
Double rowNNNNNN 
Double rowNNUP   
Double row, full complementNNCLSL02  
Double row, full complementNNCFSL1850  
Double row, full complementNNCSL0148


Double row, full complementNNFSL0450   



SKF spherical roller bearings interchange

Part NumberVery light239xx239xx239xx239xx
Part Number SuffixRetaining flanges on the inner ring, guide ring centered on the inner ring machined brass cageCA, CACMCAMYM
Flangeless inner ring, guide ring centered on the inner ring, two stamped steel cagesCC(J), CJ C, CDCJ
Optimized internal design for increased load carrying capacityEE1EA 
Tapered bore, taper 1:12KKKK
Tapered bore, taper 1:30K30K30K30K
Annular groove and three lubrication holes in the outer ringW33SE4W33
Bearing for vibratory applications, surface-hardened stamped steel cagesVA405T41AC4U15-VSW800C4
Same as VA405, but PTFE coated cylindrical inner ring boreVA406   


SKF bearing designation

The designations of most SKF rolling bearings follow a bearing designation system. The complete SKF bearing nomenclature may consist of a basic designation with or without one or more supplementary designations. The complete designation is always marked on the bearing package, whereas the marking on the bearing may be incomplete or deviate from the designation. The basic designation identifies:

  • SKF bearing type
  • SKF basic design
  • the boundary dimensions

Prefixes and suffixes identify bearing components or variants having a design and/or feature(s) that differ in some respect from the basic design.



Designations for SKF rolling bearings

SKF basic designations



CodeBearing typeCodeBearing typeCodeBearing type
0Double row angular contact ball bearing7Single row angular contact ball bearingQJFour-point contact ball bearing
1Self-aligning ball bearing8Cylindrical roller thrust bearingTTapered roller bearing 

in accordance with 

ISO 355:2007

2Spherical roller bearing, spherical roller thrust bearingCCARB toroidal roller bearing 
3Tapered roller bearingNCylindrical roller bearing. Two or more letters are used to identify the number of the rows or the configuration of the flanges, e.g. NJ, NU, NUP, NN, NNU, NNCF etc.
4SKF double row deep groove ball bearing
5Thrust ball bearing
6SKF single row deep groove ball bearing

A basic SKF designation typically contains three to five digits. Some products, like cylindrical roller bearings, can have a combination of alphanumeric characters. The number and letter combinations have the following meaning:

  • The first digit or letter or combination of letters identifies the bearing type and eventually a basic variant.
  • The following two digits identify the ISO dimension series. The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D).
  • The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.


SKF diameter series designations

Bearing typeDiameter series
 7, 8, 90, 12, 3, 4
Deep groove ball bearings1)


617, 618, 619602, 3
627, 628160, 16142, 43
637, 638, 63963062, 63, 64, 622, 623
Angular contact ball bearings


 7032, 33
  72, 73
  QJ 2, QJ 3
Self-aligning ball bearings2)13910, 13012, 13, 112
  22, 23
Cylindrical roller bearings


 NU 10, 20NU 2, 3, 4, 12, 22, 23
 NJ 10NJ 2, 3, 4, 22, 23
  NUP 2, 3, 22, 23
  N 2, 3
Needle roller bearingsNA 48, 49, 69  
Full complement cylindricalNCF 18, 19, 28, 29NCF 30NCF 22
roller bearings


NNC 48, 49NNF 50NJG 23
NNCF 48, 49NNCF 50 
NNCL 48, 49  
Spherical roller bearings238, 239230, 231222, 232
248, 249240, 241213, 223
CARB toroidal roller bearingsC 39, 49, 59, 69C 30, 31C 22, 23
 C 40, 41C 32

1) Bearings 604, 607, 608, 609 belong to diameter series 0, 

bearings 623, 624, 625, 626, 627, 628 and 629 to diameter series 2, 

bearings 634, 635 and 638 to diameter series 3 

bearing 607/8 to diameter series 9

2) Bearing 108 belongs to diameter series 0, 

bearings 126, 127 and 129 to diameter series 2, 

bearing 135 to diameter series 3

The most important exceptions in the basic bearing designation system are: 

  1. In a few cases, the digit for the bearing type or the first digit of the dimension series identification is omitted.
  2. Bearings with a bore diameter of 10, 12, 15 or 17 mm have the following size code identifications: e.g. 6300-2RSH (d=10mm)
    00 = 10 mm
    01 = 12 mm
    02 = 15 mm
    03 = 17 mm
  3. For bearings with a bore diameter < 10 mm, or ≥ 500 mm, the bore diameter is generally given in millimeters (uncoded). The size identification is separated from the rest of the bearing designation by an oblique stroke, e.g. 628/8-2Z (d = 8 mm) or 511/530 (d = 530 mm). This is also true of standard bearings in accordance with ISO 15:2011 that has a bore diameter of 22, 28, or 32 mm, e.g. 62/22 (d = 22 mm).
  4. For some bearings with a bore diameter < 10 mm, such as deep groove, self-aligning, and angular contact ball bearings, the bore diameter is also given in millimeters (uncoded) but is not separated from the series designation by an oblique stroke, e.g. 608-2RSH/C3 (d=8mm) 629 or 129 (d = 9 mm).
  5. Bore diameters that deviate from the standard bore diameter of a bearing are uncoded and given in millimeters up to three decimal places. This bore diameter identification is part of the basic designation and is separated from the basic designation by an oblique stroke, e.g. 6202/15.875 (d = 15,875 mm = 5/8 in).

Series designations

Each standard bearing belongs to a given bearing series, which is identified by the basic designation without the size identification. Series designations often include a suffix A, B, C, D, or E or a combination of these letters. These letters are used to identify differences in internal design.

SKF bearing designations not covered by the basic system

The designations for certain SKF bearing types are either not covered, or are only partially covered.

SKF Y-bearings (insert bearings)

The designations for SKF Y-bearings differ somewhat from those described in the basic designation system and are covered in the relevant product section.

SKF Needle roller bearings

The designations for needle roller bearings do not fully follow the basic designation system and are covered in the relevant product section.

SKF tapered roller bearings

The designations for metric tapered roller bearings follow either the basic designation system or a designation system, established by ISO in 1977, covered in ISO 355:2007

Inch tapered roller bearings are designated in accordance with the relevant ANSI/ABMA standard. The designation system for tapered roller bearings is explained in the relevant product section.

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