Metric Basic External DIN471 System of Measurement Metric Location Style External Thickness 1.2 mm Fits Shaft Diameter 19 mm For Bore Diameter Not Applicable Fits Groove Diameter 18 mm Fits Groove Width 1.3 mm Fits Groove Depth 0.5 mm Free Inside Diameter 17.5 mm Free Outside Diameter Not Applicable Clearance Diameter Not Applicable Material Spring Steel Material Grade/Class 1060-1090 Tensile Strength Not Applicable Ring Type External Ring Thickness Tolerance +0.000/-0.060 mm