Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size #4 Inside Diameter 0.125 in Outside Diameter 5/16 in Maximum Thickness 0.031 in System of Measurement Inch Minimum Thickness 0.031 in Pack Size Small Pack Package Quantity 50