Corrosion Guide for Connectors

Finish/Material	Description
Gray Paint	Water-based paint intended to protect the product while it is warehoused and in transit to the jobsite.
Powder Coating	Baked on paint finish that is more durable than our standard
Z275	Zinc galvanised coating weight of 275g of zinc per square meter, total both sides. Hot dip galvanised per ASTM A-653.
Electrocoating (E-CoatTM)	Electrocoating utilises electrical current to deposit the coating material on the fastener. After application, the coating is cured in an oven. Electrocoating provides a minimum amount of corrosion protection and is recommended for dry, non-corrosive applications only.
ZMAX	Zinc galvanised coating weight of 550g of zinc per square meter, total both sides. Hot dip galvanised per ASTM A-653. These products require hot-dip galvanised fasteners (fasteners which meet the specifications of ASTM A153).
HOTDIP	Products are hot-dip galvanised after fabrication (2.0 mm and thicker). The coating weight increases with material thickness. The minimum average coating weight is 600g per square meter, total both sides. Hot dip galvanised per ASTM A-123. These products require hot-dip galvanised fasteners (fasteners which meet the specifications of ASTM A153). Anchor bolts are hot-dip galvanised per ASTM F2329.
Type 410 Stainless Steel with Protective Top Coat	Carbon martensitic grade of stainless steel which is inherently magnetic, with an added protective top coat. This material can be used in mild atmospheres and many mild chemical environments.
Mechanically Galvanised	Simpson Strong-Tie Strong-Drive® SD Connector screw is manufactured with a mechanically-applied zinc coating in accordance with ASTM B695, Class 55 with a supplemental overcoat. These fasteners are compatible with painted and zinc-coated (Z275 and ZMAX®) connectors.
Double-Barrier Coating	Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector screw is manufactured with two different finishes that together provide a level of corrosion protection that equals that provided by the previous HDG coating.
SST300	Connectors are manufactured from Type 316L stainless steel, and provide greater durability against corrosion. Stainless-steel nails are required with stainless-steel products, and are available from Simpson Strong-Tie.
Use ZMAX® coated or stainless-steel connectors in outdoor environments and to protect against corrosion from preservative-treated wood. Use ONLY fasteners with a hot-dip galvanised (HDG) or double-barrier coating with ZMAX® and post-HDG connectors. Use ONLY stainless-steel fasteners with stainless-steel connectors. Visit strongtie.com/info for critical information.