Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 5/8 in Inside Diameter 0.688 in Outside Diameter 1 3/4 in Maximum Thickness 0.109 in System of Measurement Inch Minimum Thickness 0.109 in Pack Size Small Pack Package Quantity 25