Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 1/4 in Bore Thread Size Not Applicable Collar Outside Diameter 11/16 in Inside Height to Flat Not Applicable Clearance Diameter 0.76 in Collar Width 5/16 in Collar Material Stainless Steel Keyway Width Not Applicable Collar Material Grade 304 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Thread Size #4-40