Jaw Coupling Hub, Coupling Size JC16, Outside Diameter 1 in, Coupling Overall Length 1 25/64 in, System of Measurement Inch, Hub Material Aluminum, Maximum Speed 8,000 RPM, Keyway Depth Not Applicable, Keyway Width Not Applicable, Bore Diameter 1/2 in, Shaft Locking Type Clamp On, Bore Type Round Bore, Jaw Profile Curved, Screw Thread Size M3, 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 in