Rigid Shaft Coupling Bore Diameter 1 1/2 in Bore Diameter 2 1/2 in Bore Type Round Clearance Diameter 1.25 in Coupling Construction Two-Piece Coupling Material Carbon Steel Coupling Outside Diameter 1 1/4 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 4 000 RPM Maximum Torque 450 in-lb Overall Length 1 7/8 in