Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1 5/8 in Bore Thread Size Not Applicable Collar Outside Diameter 2 5/8 in Inside Height to Flat Not Applicable Clearance Diameter 2.88 in Collar Width 11/16 in Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 303 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Carbon Steel