Ring Shank Pole Barn Nails 3-1/2 Inch 16D Heat Treated Hot Dipped Galvanized 5 Pounds. Pole Barn Nails ae designed to reduce or prevent rocking and twisting for wooden structures where high holding power is necessary. Used in load bearing situations. Hot dipped galvanized nails are coated by passing them through a molten batch of zinc that results in very high corrosion resistance suitable for some acidic and treated lumber. They will corrode over time as their coating wears, but are generally good for the lifetime of the application. Hot dipped galvanizing meets ASTM-A153.