SKF self-aligning ball bearing designation

SKF self-aligning ball bearing designation follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes.

1 Prefixes (n.a.)

2 Basic designation
Listed in SKF bearing designation

3 Suffixes - Internal design
E Optimized internal design for increased load carrying capacity 

4 Suffixes - External design (seals, snap ring groove etc.)
-2RS1 Contact seal, NBR, on both sides 
K Tapered bore, taper 1:12

5 Suffixes - Cage design
M Machined brass cage, ball centred 
TN9 Glass fibre reinforced PA66 cage, ball centred 

6.1 Suffixes - Materials, heat treatment (n.a.) 


6.2 Suffixes - Accuracy, clearance, preload, quiet running
C2 Radial internal clearance smaller than Normal 
C3  Radial internal clearance greater than Normal 

6.3 Suffixes - Bearing sets, matched bearings (n.a.)

6.4 Suffixes - Stabilization (n.a.)

6.5 Suffixes - Lubrication
W64 Solid Oil 

6.6 Suffixes - Other variants (n.a.) 

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