Rigid Shaft Coupling Bore Diameter 1 1 1/2 in Bore Diameter 2 1 1/2 in Bore Type Round Keyed Clearance Diameter 2.5 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 2 1/2 in Different Bore Sizes No Keyway Depth 1 3/16 in Keyway Depth 2 3/16 in Minimum Bore Diameter 1 1/2 in Keyway Width 1 3/8 in Keyway Width 2 3/8 in Maximum Bore Diameter 1 1/2 in Maximum Speed 4 000 RPM Maximum Torque 3 700 in-lb Overall Length 3 3/4 in