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 3/8 in Inside Diameter 0.406 in Outside Diameter 1 in Maximum Thickness 0.151 in System of Measurement Inch Minimum Thickness 0.104 in Color Silver Inside Diameter Tolerance +0.015 in -0.005 in Made in North America No Manufacturer Location Globally Sourced Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F