CSK8 One-Way Clutch Bearing - Sprag Freewheel BackstopCSK8 One Way Clutch Bearing Sprag Freewheel Backstop 8mm ID 22mm OD 9mm Wide Torque Capacity: 2. 5 Nm 1 Bearing The CSK8 is a precision engineered one way clutch bearing designed to allow rotation in one direction while locking in the other. Its compact form factor makes it ideal for tight mechanical systems where backstopping, overrunning, or indexing is required such as conveyors, textile machines, or gear driven motors. Inner diameter (ID): 8mm