Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125A DIN 6916 Material Steel Material Grade/Class Grade 8 Finish Zinc Yellow For Screw Size M30 Inside Diameter 31 mm Outside Diameter 56 mm Maximum Thickness 5 mm System of Measurement Metric Minimum Thickness 5 mm Color Yellow Pack Size Small Pack Thickness Tolerance +/-0.60mm Package Quantity 10