Rigid Shaft Coupling Bore Diameter 1 1/8 in Bore Diameter 2 1/8 in Bore Type Round Clearance Diameter 0.58 in Coupling Construction One-Piece Coupling Material Carbon Steel Coupling Outside Diameter 1/2 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 1/8 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 1/8 in Maximum Speed 4 000 RPM Maximum Torque 18 in-lb Overall Length 13/16 in