Flat Washer, Flat Washer Type Standard, Dimensional Standards AMPG 2001 FL.01, Material Brass, Finish Plain, For Screw Size 1/4 in, Inside Diameter 0.281 in, Outside Diameter 5/8 in, Maximum Thickness 3/16 in, System of Measurement Inch, Minimum Thickness 3/16 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM B16, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Radiation-Resistant, Rust-Resistant