Flat Washer, Dimensional Standards AMPG 2001 FL.01, Material Brass, Finish Plain, For Screw Size #4, Inside Diameter 0.125 in, Outside Diameter 4 in, Maximum Thickness 5/64 in, System of Measurement Inch, Minimum Thickness 5/64 in, Inside Diameter Tolerance +/-0.010 in, Made in North America Made in North America, Material Quality Standards ASTM B16, Outside Diameter Tolerance +/-0.010 in, Resistance Properties Corrosion-Resistant, Rust-Resistant, Tensile Strength 58,000 psi