Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size M36 Inside Diameter 37 mm Outside Diameter 66 mm Maximum Thickness 5 mm System of Measurement Metric Minimum Thickness 5 mm Color Silver Inside Diameter Tolerance 1.457-1.481 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C