Rigid Shaft Coupling Bore Diameter 1 2 1/4 in Bore Diameter 2 2 1/4 in Bore Type Round Keyed Clearance Diameter 3.5 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 3 1/2 in Different Bore Sizes No Keyway Depth 1 1/4 in Keyway Depth 2 1/4 in Minimum Bore Diameter 2 1/4 in Keyway Width 1 1/2 in Keyway Width 2 1/2 in Maximum Bore Diameter 2 1/4 in Maximum Speed 4 000 RPM Maximum Torque 13 680 in-lb Overall Length 5 in