SKF Four Point Angular Contact Ball Bearing Suffix Meaning
B20: Narrowed width tolerance
C2: Axial clearance is smaller than normal level
C2H: Axial clearance is the upper half of the clearance range of C2 group
C2L: Axial clearance is the lower half of the clearance range of C2 group
C3: Axial clearance is greater than normal group
C4: Axial clearance is greater than C3
CNL: Axial clearance is the lower half of the normal group clearance range
FA: machined steel cage, outer ring guide
MA: machined brass cage , Outer ring guide
N2: outer ring with two 180-degree positioning grooves
PHA: injection molded polyetherketone (PEEK) cage, outer ring guide
P6: dimensional accuracy and rotation accuracy meet ISO tolerance level 6
P63: P6+C3
P64: P6+C4
S1: Special heat treatment, bearing ring keeps dimensionally stable below +200 degrees
