Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size M10 Inside Diameter 10.5 mm Outside Diameter 20 mm Maximum Thickness 2.2 mm System of Measurement Metric Minimum Thickness 1.8 mm Color Silver Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A276 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack