Rigid Shaft Coupling Bore Diameter 1 3/8 in Bore Diameter 2 3/8 in Bore Type Round Keyed Clearance Diameter 1.06 in Coupling Construction Two-Piece Coupling Material Carbon Steel Coupling Outside Diameter 7/8 in Different Bore Sizes No Keyway Depth 1 1/16 in Keyway Depth 2 1/16 in Minimum Bore Diameter 3/8 in Keyway Width 1 1/8 in Keyway Width 2 1/8 in Maximum Bore Diameter 3/8 in Maximum Speed 4 000 RPM Maximum Torque 178 in-lb Overall Length 1 3/8 in