Metric Basic External DIN471 System of Measurement Metric Location Style External Thickness 1.2 mm Fits Shaft Diameter 21 mm For Bore Diameter Not Applicable Fits Groove Diameter 20 mm Fits Groove Width 1.3 mm Fits Groove Depth 0.5 mm Free Inside Diameter 19.5 mm Free Outside Diameter Not Applicable Clearance Diameter Not Applicable Material Steel Material Grade/Class Not Graded Tensile Strength Not Applicable Ring Type External Ring Thickness Tolerance +0.000/-0.060 mm