Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 316 Finish NL-19 For Screw Size #10 Inside Diameter 0.219 in Outside Diameter 1/2 in Maximum Thickness 0.104 in System of Measurement Inch Minimum Thickness 0.064 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B80 Thickness Tolerance +0.036 to 0.065 in Package Quantity 100