Retaining Ring Internal 1 mm Thk System of Measurement Metric Location Style Internal Thickness 1 mm Fits Shaft Diameter Not Applicable For Bore Diameter 20 mm Fits Groove Diameter 21 mm Fits Groove Width 1.1 mm Fits Groove Depth 0.5 mm Free Outside Diameter 21.5 mm Material Stainless Steel Finish Plain Material Grade/Class 18-8 Tensile Strength 150 000 psi Ring Type Housing Ring Material Quality Standards DIN 472 Manufacturer Location Made in USA