SAE Washer Flat Washer Type SAE Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size #6 Inside Diameter 0.156 in Outside Diameter 3/8 in Maximum Thickness 0.047 in System of Measurement Inch Minimum Thickness 0.047 in Pack Size Small Pack Rockwell Hardness RB40 Thickness Tolerance +/-0.015 in Package Quantity 790