Rigid Shaft Coupling Bore Diameter 1 5/16 in Bore Diameter 2 5/16 in Bore Type Round Clearance Diameter 0.63 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 5/8 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 5/16 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 5/16 in Maximum Speed 1 800 RPM Maximum Torque 123 in-lb Overall Length 1 in