Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 316 Finish NL-19 For Screw Size 3/4 in Inside Diameter 0.813 in Outside Diameter 1 15/32 in Maximum Thickness 0.134 in System of Measurement Inch Minimum Thickness 0.134 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B80 Thickness Tolerance +/-0.026 in Package Quantity 10