Inverted Internal Ring System of Measurement Inch Location Style Internal Thickness 0.042 in Fits Shaft Diameter Not Applicable For Bore Diameter 1 in Fits Groove Diameter 1.066 in Fits Groove Width 0.046 in Fits Groove Depth 0.033 in Free Inside Diameter Not Applicable Free Outside Diameter 1.081 in Clearance Diameter 0.81 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type Internal Inverted Ring