Metric Basic External DIN471 System of Measurement Metric Location Style External Thickness 1.5 mm Fits Shaft Diameter 30 mm For Bore Diameter Not Applicable Fits Groove Diameter 28.6 mm Fits Groove Width 1.6 mm Fits Groove Depth 0.7 mm Free Inside Diameter 27.9 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