Flat Washer Flat Washer Type Oversized Dimensional Standards DIN 9021 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size M10 Inside Diameter 10.5 mm Outside Diameter 30 mm Maximum Thickness 2.5 mm System of Measurement Metric Minimum Thickness 2.5 mm Color Silver Inside Diameter Tolerance 0.413-0.424 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C