Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 3/4 in Bore Thread Size Not Applicable Collar Outside Diameter 2 3/4 in Inside Height to Flat Not Applicable Clearance Diameter 2.9 in Collar Width 11/16 in Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1045 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Collar Material Finish Black Oxide