CSK17P One-Way Bearing - One inner Ring Key-way Sprag Freewheel Backstop ClutchCSK17P One Way Clutch Bearing with Keyway 17mm x 40mm x 12mm Sprag Freewheel with Inner Ring Keyway The CSK17P is a one way clutch bearing designed for applications where reverse rotation must be blocked. With a keyway on the inner ring, it provides positive shaft locking, making it ideal for conveyor systems, backstops, textile equipment, and any machinery needing overrunning or indexing control. 1 clutch bearing per pack Size: 17mm ID x 40mm OD x