Jaw Coupling Hub Coupling Size MJC51 Outside Diameter 50.8 mm Coupling Overall Length 61 mm System of Measurement Metric Hub Material Aluminum Maximum Speed 8 000 RPM Keyway Depth 2.8 mm Keyway Width 6 mm Bore Diameter 20 mm Shaft Locking Type Clamp On Bore Type Round Bore with Keyway Jaw Profile Curved Screw Thread Size M5 Bore Tolerance +0.05/-0.00 mm Fail Safe Yes Shaft Tolerance +0.000/-0.013 mm Full Bearing Support Required Yes Hub Diameter 50.8 mm