Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size M4 Inside Diameter 4.3 mm Outside Diameter 9 mm Maximum Thickness 0.9 mm System of Measurement Metric Minimum Thickness 0.7 mm Color Silver Inside Diameter Tolerance +0.18 mm Made in North America No Manufacturer Location Globally Sourced Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F