Flat Washer,M6 F/W 6.4 X 16 X 2.8-3.4 1, Dimensional Standards AMPG 2001 FL.01, Material Stainless Steel, Material Grade/Class Through Hardened, Finish Plain, For Screw Size M6, Inside Diameter 6.4 mm, Outside Diameter 16 mm, Maximum Thickness 3 mm, System of Measurement Metric, Minimum Thickness 2.8 mm, Made in North America Made in North America, Material Quality Standards ASTM A564 Type 630, Resistance Properties Chemical-Resistant, Corrosion-Resistant, Tensile Strength 160,000 psi