Flat Washer Flat Washer Type Standard Dimensional Standards ANSI B18.22.1 Material PEEK Material Grade/Class Grade 2 Finish Plain For Screw Size M8 Inside Diameter 8.5 mm Outside Diameter 15 mm Maximum Thickness 2 mm System of Measurement Metric Minimum Thickness 2 mm Color Brown Maximum Temperature 500 Degrees F Minimum Temperature -50 Degrees F Pack Size Small Pack Rockwell Hardness D87.5 Thickness Tolerance +/-0.5mm Package Quantity 10