Rigid Shaft Coupling Bore Diameter 1 1/2 in Bore Diameter 2 1/2 in Bore Type Round Clearance Diameter 1 in Coupling Construction One-Piece Coupling Material Aluminum Coupling Outside Diameter 1 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 1/2 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1/2 in Maximum Speed 3 500 RPM Maximum Torque 143 in-lb Overall Length 1 1/2 in