SKF four-point contact ball bearings designation

SKF four-point contact ball bearings 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 (n.a.)

4 Suffixes - External design (seals, snap ring groove etc.)
N2 Two locating slots (notches) in one outer ring side face, 180° apart

5 Suffixes - Cage design
FA Machined steel cage, outer ring centred
MA Machined brass cage, outer ring centred. 
PHAS Glass fibre reinforced PEEK cage, with lubrication grooves in the guiding surface, outer ring centred

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

6.2 Suffixes - Accuracy, clearance, preload, quiet running
P6 Dimensional and geometrical tolerances to class P6 
P62 P6 + C2
P63 P6 + C3
P64 P6 + C4
P6CNL  P6 + CNL 
CNL  Axial internal clearance in the lower half of the Normal range 
C2 Axial internal clearance smaller than Normal
C2H Axial internal clearance in the upper half of the C2 range 
C2L Axial internal clearance in the lower half of the C2 range 
C3 Axial internal clearance greater than Normal
C4 Axial internal clearance greater than C3
344524  C2H + CNL 

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

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
309829 Larger balls 

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