External Grip Ring System of Measurement Inch Location Style External Thickness 0.035 in Fits Shaft Diameter 1/4 in For Bore Diameter Not Applicable Fits Groove Diameter 0.24 in Fits Groove Width 0.041 in Fits Groove Depth 0.005 in Free Inside Diameter 0.238 in Free Outside Diameter Not Applicable Clearance Diameter Not Applicable Material Steel Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Grip Ring Thickness Tolerance +/-0.003 in