Jaw Coupling Hub Coupling Size JS26 Outside Diameter 1 5/8 in Coupling Overall Length 2 3/32 in System of Measurement Inch Hub Material Aluminum Maximum Speed 8 000 RPM Keyway Depth Not Applicable Keyway Width Not Applicable Bore Diameter 3/4 in Shaft Locking Type Set Screw Bore Type Round Bore Jaw Profile Curved Screw Thread Size M5 Bore Tolerance +0.002/-0.000 in Fail Safe Yes Shaft Tolerance +0.0000/-0.0005 in Full Bearing Support Required Yes Hub Diameter 1 5/8 in