Hot-Dip Galvanizing


Watch timber bolts be hot-dip galvanized

Hot-dip galvanizing is the most commonly specified protective coating in the marine construction industry. Bolts are submerged in a tank of hot molten zinc which metallurgically bonds the zinc to the steel. Hot-dip galvanizing offers an economical, long-term protective coating.

Portland Bolt has a galvanizing tank specifically designed for threaded fasteners. A high-speed spinner for cleaning threads results in a galvanized bolt that can easily accept a nut for trouble-free installation in the field.

ASTM Galvanizing Specifications

  • ASTM F2329 – hot-dip galvanizing specification which specifically covers bolts screws, washers, nuts, and special threaded fasteners.
  • ASTM A153 – covers hot-dip zinc galvanized coating on iron and steel hardware.
  • ASTM A123 – similar to A153, as it is not fastener-specific. It covers iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.

Frequently asked questions related to galvanizing: