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 M14 Inside Diameter 15 mm Outside Diameter 28 mm Maximum Thickness 2.5 mm System of Measurement Metric Minimum Thickness 2.5 mm Color Silver Inside Diameter Tolerance 0.591-0.601 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C