Flat Washer Flat Washer Type USS Dimensional Standards ASME B18.21.1 USS 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 0.192 in System of Measurement Inch Minimum Thickness 0.136 in Color Silver Inside Diameter Tolerance +0.030 in -0.007 in Made in North America No Manufacturer Location Globally Sourced Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F