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 7/16 in Inside Diameter 0.5 in Outside Diameter 1 1/4 in Maximum Thickness 0.121 in System of Measurement Inch Minimum Thickness 0.074 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B80 Thickness Tolerance +0.064 to 0.104 in Package Quantity 100