Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 1/4 in Bore Thread Size Not Applicable Collar Outside Diameter 2 1/16 in Inside Height to Flat Not Applicable Clearance Diameter 2.19 in Collar Width 1/2 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