Flat Washer Flat Washer Type Standard Dimensional Standards ANSI B18.22.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 1 in Inside Diameter 1.063 in Outside Diameter 2 1/2 in Maximum Thickness 0.165 in System of Measurement Inch Minimum Thickness 0.165 in Color Silver Pack Size Small Pack Rockwell Hardness B80 Thickness Tolerance 0.136-0.192 in Package Quantity 10