SKF high-capacity cylindrical roller bearings nomenclature

The designation of SKF high-capacity cylindrical roller bearings follow SKF basic designation with or without one or more prefixes and/or suffixes

1 Prefixes
L Separate inner or outer ring of a separable bearing
R Inner or outer ring with roller and cage assembly of a separable bearing 
2 Basic designation
Listed in SKF bearing nomenclature
3 Suffixes - Internal design
EC Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact
4 Suffixes - External design (seals, snap ring groove etc.)(n.a.) 
5 Suffixes - Cage design
JA Sheet steel cage, outer ring centred
JB Sheet steel cage, inner ring centred 
MH Machined brass cage, inner ring raceway centred 
6.1 Suffixes - Materials, heat treatment
L4B Bearing rings and rollers black oxidized
L5B Rollers black oxidized
L7B Inner ring and rollers black oxidized 
6.2 Suffixes - Accuracy, clearance, preload, quiet running
CN Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
  • H = Reduced clearance range corresponding to the upper half of the actual clearance range
  • L = Reduced clearance range corresponding to the lower half of the actual clearance range
  • M = Reduced clearance range corresponding to the middle half of the actual clearance range
The above letters are also used together with the clearance classes C2, C3, C4 and C5, e.g. C2H
C2 Radial internal clearance smaller than Normal
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
C5 Radial internal clearance greater than C4
6.3 Suffixes - Bearing sets, matched bearings
DR Set of two matched bearings
TR Set of three matched bearings 
QR Set of four matched bearings 
6.4 Suffixes - Stabilization
S1 Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F)
6.5 Suffixes - Lubrication (n.a.)
6.6 Suffixes - Other variants
PEX SKF Explorer bearing, used only when same-sized conventional and SKF Explorer bearings are available 

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