Flat Washer Flat Washer Type Standard Dimensional Standards DIN 9021 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size M3.5 Inside Diameter 3.7 mm Outside Diameter 11 mm Maximum Thickness 0.8 mm System of Measurement Metric Minimum Thickness 0.8 mm Pack Size Small Pack Rockwell Hardness Not Rated Package Quantity 50