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 1/2 in Inside Diameter 1.625 in Outside Diameter 3 1/2 in Maximum Thickness 0.213 in System of Measurement Inch Minimum Thickness 0.153 in Color Silver Inside Diameter Tolerance +0.045 in -0.010 in Made in North America No Manufacturer Location Globally Sourced Maximum Temperature 302 Degrees F