Rigid Shaft Coupling Bore Diameter 1 1/2 in Bore Diameter 2 1/2 in Bore Type Round Keyed Clearance Diameter 1 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 1 in Different Bore Sizes No Keyway Depth 1 1/16 in Keyway Depth 2 1/16 in Minimum Bore Diameter Not Applicable Keyway Width 1 1/8 in Keyway Width 2 1/8 in Maximum Bore Diameter Not Applicable Maximum Speed 3 500 RPM Maximum Torque 240 in-lb Overall Length 1 1/2 in