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 M27 Inside Diameter 28 mm Outside Diameter 50 mm Maximum Thickness 4 mm System of Measurement Metric Minimum Thickness 4 mm Color Silver Inside Diameter Tolerance 1.102-1.115 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C