Shaft Collar System of Measurement Inch Bore Type Round Keyed Bore Diameter 2 in Bore Thread Size Not Applicable Collar Outside Diameter 3 in Inside Height to Flat Not Applicable Clearance Diameter 3.27 in Collar Width 11/16 in Collar Material Carbon Steel Keyway Width 1/2 in Collar Material Grade 1215 Keyway Depth 1/4 in Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Alloy Steel Screw Material Finish Black Oxide