Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 1 3/8 in Inside Diameter 1.5 in Outside Diameter 3 1/4 in Maximum Thickness 0.18 in System of Measurement Inch Minimum Thickness 0.18 in Color Silver Inside Diameter Tolerance 1.49-1.545 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C