Flat Washer Flat Washer Type Standard Dimensional Standards TCMA Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size #10 Inside Diameter 0.203 in Outside Diameter 1/2 in Maximum Thickness 0.11 in System of Measurement Inch Minimum Thickness 0.078 in Color Silver Maximum Temperature 750 Degrees F Rockwell Hardness B97 Thickness Tolerance +/-1/64 in Package Quantity 25