Bowed External Ring System of Measurement Inch Location Style External Thickness 0.035 in Fits Shaft Diameter 1/2 in For Bore Diameter Not Applicable Fits Groove Diameter 0.468 in Fits Groove Width 0.055 in Fits Groove Depth 0.016 in Free Inside Diameter 0.461 in Free Outside Diameter Not Applicable Clearance Diameter 0.74 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Bowed External Ring