Basic Internal Ring System of Measurement Inch Location Style Internal Thickness 0.093 in Fits Groove Diameter 2.98 in Fits Groove Width 0.103 in Fits Groove Depth 0.084 in Free Outside Diameter 3.121 in Material Steel Material Grade/Class Not Graded Ring Type Internal Ring Clearance Diameter Type Free OD Thickness Tolerance +/-0.003 in Groove Width Tolerance +/-0.006/0.000 in Groove Diameter Tolerance +/-0.006 in