Jaw Coupling Hub, Coupling Size JS36, 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 Not Applicable, Keyway Width Not Applicable, Bore Diameter 1 in, Shaft Locking Type Set Screw, Bore Type Round Bore, Jaw Profile Curved, Screw Thread Size M8, 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