Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Steel Material Grade/Class Class 8.8 Finish Zinc Plated For Screw Size M6 Inside Diameter 6.4 mm Outside Diameter 12 mm Maximum Thickness 1.6 mm System of Measurement Metric Minimum Thickness 1.6 mm Color Silver Inside Diameter Tolerance 0.252-0.261 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C