CSK40P-2RS One-Way Bearing Sealed Sprag Freewheel Clutch Bearing inner Ring Key-wayCSK40P 2RS One Way Clutch Bearing Sealed Freewheel with Key Way, 40mm Bore The CSK40P 2RS is a one way sprag clutch bearing with a 40mm inner diameter and a built in key way for secure shaft connection. Fully sealed and ready to roll, its perfect for indexing, backstopping, or overrunning systems in motors, conveyors, or gear drives. Inner diameter: 40mm Outer diameter: 80mm Width: 27mm One key way on the inner ring for positive torque transfer Sealed