Rigid Shaft Coupling Bore Diameter 1 3/8 in Bore Diameter 2 3/8 in Bore Type Round Clearance Diameter 1.06 in Coupling Construction One-Piece Coupling Material Stainless Steel Coupling Outside Diameter 7/8 in Different Bore Sizes No Keyway Depth 1 Not Applicable Keyway Depth 2 Not Applicable Minimum Bore Diameter 3/8 in Keyway Width 1 Not Applicable Keyway Width 2 Not Applicable Maximum Bore Diameter 3/8 in Maximum Speed 4 000 RPM Maximum Torque 178 in-lb Overall Length 1 3/8 in