Flat Washer Flat Washer Type SAE Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size #8 Inside Diameter 0.188 in Outside Diameter 3/8 in Maximum Thickness 0.047 in System of Measurement Inch Minimum Thickness 0.047 in Pack Size Small Pack Package Quantity 100