Flat Washer Flat Washer Type Standard Dimensional Standards DIN 125-1A Material Alloy Steel Material Grade/Class Grade 8 Finish Plain For Screw Size M14 Inside Diameter 15 mm Outside Diameter 28 mm Maximum Thickness 2.5 mm System of Measurement Metric Minimum Thickness 2.5 mm Color Blue Pack Size Small Pack Rockwell Hardness 200HV Thickness Tolerance +/-0.2mm Package Quantity 100