Jaw Coupling Hub, Coupling Size JC36, Outside Diameter 2 1/4 in, Coupling Overall Length 3 5/32 in, System of Measurement Inch, Hub Material Aluminum, Maximum Speed 8,000 RPM, Keyway Depth 3/32 in, Keyway Width 3/16 in, Bore Diameter 5/8 in, Shaft Locking Type Clamp On, Bore Type Round Bore with Keyway, Jaw Profile Curved, Screw Thread Size M6, Bore Tolerance +0.002/-0.000 in, Fail Safe Yes, Shaft Tolerance +0.0000/-0.0005 in, Full Bearing Support Required Yes, Hub Diameter 2 1/4 in