Flat Washer Flat Washer Type Standard Dimensional Standards TCMA Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size #1 Inside Diameter 1.031 in Outside Diameter 2 in Maximum Thickness 0.204 in System of Measurement Inch Minimum Thickness 0.172 in Color Silver Maximum Temperature 750 Degrees F Rockwell Hardness B97 Thickness Tolerance +/-1/64 in Package Quantity 10