Shaft Collar, System of Measurement Inch, Bore Type Threaded, Bore Diameter 2 1/4 in, Bore Thread Size 2 1/4 In.-12, Collar Outside Diameter 3 1/4 in, Inside Height to Flat Not Applicable, Clearance Diameter 3.5 in, Collar Width 3/4 in, Collar Material Stainless Steel, Keyway Width Not Applicable, Collar Material Grade 303, Keyway Depth Not Applicable, Thread Direction Right Hand Thread, Center to Lever Top Not Applicable, Collar Construction 1-Piece, Screw Material Stainless Steel