Jaw Coupling Hub Coupling Size MJS51 Outside Diameter 50.8 mm Coupling Overall Length 61 mm System of Measurement Metric Hub Material Aluminum Maximum Speed 8 000 RPM Keyway Depth 3.3 mm Keyway Width 8 mm Bore Diameter 25 mm Shaft Locking Type Set Screw Bore Type Round Bore with Keyway Jaw Profile Curved Screw Thread Size M6 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