Inverted External Ring System of Measurement Inch Location Style External Thickness 0.05 in Fits Shaft Diameter 1 3/8 in For Bore Diameter Not Applicable Fits Groove Diameter 1.291 in Fits Groove Width 0.056 in Fits Groove Depth 0.042 in Free Inside Diameter 1.272 in Clearance Diameter 1.65 in Material Steel Finish Black Phosphate Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Inverted Ring Thickness Tolerance +/-0.002 in