Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Brass Material Grade/Class Grade 2 Finish Plain For Screw Size M10 Inside Diameter 10.5 mm Outside Diameter 20 mm Maximum Thickness 2 mm System of Measurement Metric Minimum Thickness 2 mm Pack Size Small Pack Thickness Tolerance +/-0.20mm Package Quantity 25