Rigid Shaft Coupling, 1 Piece Set Screw, Inch, Bore Dia. 5/8 in, Aluminum, Finish Plain, Outside Dia. 1 1/4 in, Overall Length 2 in, Without Keyway, Clearance Dia. 1.25 in, Screw Size 5/16 In. -18, Max. Torque 281 in-lb, Max. RPM 3, 500 RPM. This item has been restricted from sale in the following state (s): []