CSK(WOK) Series One Way Bearing is a sprag type freewheel,aiso named CSK,BB,KK etc.,it is bearing supported. 1. CSK(WOK) Series One Way Bearing is a sprag type freewheel,also named CSKBBKKOW etc.,it intergrated into 62 series ball bearing (except size 8 and 40).It is bearing supported, delivered grease lubricated and protected against dust of more than 0.3mm.The use of additionalnylostype seals ...