Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 3/4 in Inside Diameter 0.781 in Outside Diameter 2 in Maximum Thickness 0.156 in System of Measurement Inch Minimum Thickness 0.156 in Pack Size Small Pack Package Quantity 20