Designation system

The designations of most SKF rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes (→ Basic bearing designation system).
An example and the applicable options for double row angular contact ball bearings are given below.
Basic bearing designation system


3207 A-2Zwhere3207 =Test Designation 2
A =Test Designation 4
-2Z =Test Designation 4
Test Designation 1Prefixes (n.a.)

Test Designation 2Basic designation
Listed in table 1 or drawing number identification

Catalogue image - Test Designation 3Suffixes - Internal design
No filling slots
Two-piece inner ring

Test Designation 4Suffixes - External design (seals, snap ring groove, execution, etc.)
NSnap ring groove in the outer ring
NRSnap ring groove in the outer ring, with appropriate snap ring
CBControlled axial internal clearance
-2RS1Contact seal, NBR, on both sides
-2ZShield on both sides

Catalogue image - Test Designation 5Suffixes - Cage design
Stamped steel cage, ball centred
Stamped steel cage, ball centred (bearing with a two-piece inner ring)
MMachined brass cage, ball centred
MAMachined brass cage, outer ring centred.
TN9Glass fibre reinforced PA66 cage, ball centred

Catalogue image - Test Designation 6.1Suffixes - Materials, heat treatment (n.a.)

Test Designation 6.2Suffixes - Accuracy, clearance, preload, quiet running
P5Dimensional and geometrical tolerances to class P5
P6Dimensional and geometrical tolerances to class P6
P62P6 + C2
P63P6 + C3
P64P6 + C4
C2Axial internal clearance smaller than Normal
C3Axial internal clearance greater than Normal
C4Axial internal clearance greater than C3

Catalogue image - Test Designation 6.3Suffixes - Bearing sets, matched bearings (n.a.)

Test Designation 6.4Suffixes - Stabilization (n.a.)

Test Designation 6.5Suffixes - Lubrication




Grease suffixes (table 2)

Test Designation 6.6Suffixes - Other variants (n. a.)
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