Shaft Collar System of Measurement Inch Bore Type Threaded Bore Diameter 1 3/4 in Bore Thread Size 1 3/4 In.-16 Collar Outside Diameter 2 3/4 in Inside Height to Flat Not Applicable Clearance Diameter 3.05 in Collar Width 11/16 in Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1215 Keyway Depth Not Applicable Thread Direction Right Hand Thread Center to Lever Top Not Applicable Collar Construction 1-Piece Screw Material Alloy Steel