Flat Washer, Flat Washer Type Oversized, Dimensional Standards ASME B18.22.1, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 1/2 in, Inside Diameter 0.531 in, Outside Diameter 1 1/8 in, Maximum Thickness 5/32 in, System of Measurement Inch, Minimum Thickness 7/64 in, Color Silver, Inside Diameter Tolerance +0.015 in ; -0.005 in, Made in North America Not Made in North America, Manufacturer Location Globally Sourced, Maximum Temperature 302 Degrees F