Flat Washer Flat Washer Type Standard Dimensional Standards DIN 9021 Material Steel Material Grade/Class Grade 2 Finish Zinc Yellow 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 Yellow 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