ASK Series
ASK is a ramp & roller type clutch bearing supported by two rows of roller bearings. Nominal outside envelope dimensions are the same as a 60 Series bearing.
CSK Series
The CSK Series is a sprag type clutch integrated into a 62 Series ball bearing (except sizes 8 and 40).
GFK Series
Model GFK is a sprag type clutch integrated into a 59 Series ball bearing.