Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size M16 Inside Diameter 17 mm Outside Diameter 30 mm Maximum Thickness 3 mm System of Measurement Metric Minimum Thickness 3 mm Color Silver Inside Diameter Tolerance 0.669-0.68 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C