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CSK20 One-Way Clutch Ball Bearing - 20mm Sprag Freewheel Backstop 2 inch diameter SR144Z Hybrid Ceramic Ball BearingCSK20 One Way Clutch Ball Bearing 20mm x 47mm x 14mm Sprag Freewheel Backstop The CSK20 is a one way clutch bearing built for motion control, it lets your shaft spin in one direction while locking the other way to stop rollback or reverse motion. Perfect for conveyor belts, printing gear, textile systems, and backup protection in rotating machinery. Inner diameter: 20mm Outer diameter: 47mm Width: 14mm Torque capacity: 40 Nm Bearing type: Sprag clutch