Flat Washer Flat Washer Type Standard Dimensional Standards ASTM F844 Material Stainless Steel Material Grade/Class 18-8 Finish NL-19 For Screw Size #10 Inside Diameter 0.203 in Outside Diameter 7/16 in Maximum Thickness 0.032 in System of Measurement Inch Minimum Thickness 0.032 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B70 Thickness Tolerance +/-0.010 in Package Quantity 100