Bowed Internal Ring System of Measurement Inch Location Style Internal Thickness 0.035 in Fits Shaft Diameter Not Applicable For Bore Diameter 1/2 in Fits Groove Diameter 0.53 in Fits Groove Width 0.055 in Fits Groove Depth 0.015 in Free Inside Diameter Not Applicable Free Outside Diameter 0.548 in Clearance Diameter 0.29 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Bowed Internal Ring