Rigid Shaft Coupling Bore Diameter 1 1 3/8 in Bore Diameter 2 1 3/8 in Bore Type Round Keyed Clearance Diameter 2.5 in Coupling Construction One-Piece Coupling Material Stainless Steel Coupling Outside Diameter 2 1/2 in Different Bore Sizes No Keyway Depth 1 5/32 in Keyway Depth 2 5/32 in Minimum Bore Diameter 1 3/8 in Keyway Width 1 5/16 in Keyway Width 2 5/16 in Maximum Bore Diameter 1 3/8 in Maximum Speed 3 500 RPM Maximum Torque 825 in-lb Overall Length 4 1/2 in