Flat Washer Flat Washer Type Standard Material Alloy Steel Material Grade/Class Grade 2 Finish Plain For Screw Size M6 Inside Diameter 6.87 mm Outside Diameter 13 mm Maximum Thickness 2.7 mm System of Measurement Metric Minimum Thickness 2.7 mm Color Blue Pack Size Small Pack Rockwell Hardness RC38 RoHS Compliant Yes Package Quantity 25