Rigid Shaft Coupling, 1 Piece Clamp, Inch, Bore Dia. 1 1/4 in, Steel, Finish Black Oxide, Outside Dia. 2 5/16 in, Overall Length 2 5/16 in, With Keyway, Clearance Dia. 2.313 in, Screw Size 1/4 In. -28, Keyway Width 1/4 in, Max. Torque 3, 080 in-lb, Max. RPM 4, 000 RPM