Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.21.1-2009 (R2016) Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size #10 Inside Diameter 0.219 in Outside Diameter 1/2 in Maximum Thickness 0.063 in System of Measurement Inch Minimum Thickness 0.063 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rust Resistant RoHS Compliant Yes Package Quantity 435