Shaft Collar System of Measurement Inch Bore Type Round Bore Diameter 2 in Bore Thread Size Not Applicable Collar Outside Diameter 3 in Inside Height to Flat Not Applicable Clearance Diameter 3 in Collar Width 7/8 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 1-Piece Screw Thread Size 1/2 In.-13 For Shaft Diameter 2 in