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Materials and Coatings Available for Fasteners

updated 1/5/15

Simpson Strong-Tie® connectors, anchors and fasteners feature a wide range of materials and coatings designed to meet specific performance criteria. It is important to select a material and/or coating that is suitable for the intended application and environment based upon factors such as corrosion resistance and mechanical properties of the material. For more information on selecting connectors, anchors and fasteners based upon corrosion resistance, please see General Corrosion Risks, Guidelines for Selecting the Proper Materials and Coatings, Materials and Coatings Available – Connectors and Anchors, and Materials and Coatings Available – Fasteners for more information on selecting products based on corrosion resistance.

Simpson Strong-Tie Company Inc. welcomes the opportunity to provide assistance in fastener selection, please call (800) 999-5099 or visit Ask Simpson online in the event that technical support is needed.

Low Level of Corrosion Resistance

Clear Zinc

Electroplated clear zinc is applied in accordance with ASTM F1941. In the ASTM B117 salt spray test, clear zinc provides 12 hours of protection before the first appearance of red rust.

Electrocoating (E-Coat™)

Electrocoating utilizes 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 intended for dry, non-corrosive applications only.

Gray Phosphate

Gray phosphate provides a minimum amount of corrosion protection and is intended for dry, non-corrosive applications only.

Black Phosphate

Black phosphate provides a minimum amount of corrosion protection and is intended for dry noncorrosive applications only.

Heavy Zinc Electroplate

Electroplated zinc applied to a thickness in accordance with ASTM A641 (Class 1).

Yellow Zinc

Electroplated zinc applied in accordance with ASTM F1941. In the ASTM B117 salt spray test, yellow zinc provides 120 hours of protection before the first appearance of red rust.

410 Stainless Steel

Type 410 stainless steel is a low-carbon martensitic grade of stainless steel that can be hardened and is inherently magnetic. This material resists corrosion in mild atmospheres and many mild chemical environments.

Medium Level of Corrosion Resistance

Quik Guard® Coating

Quik Guard is a proprietary coating that consists of an electrodeposited base layer with organic paint layer that provides equivalent protection to hot-dip galvanization in some exposures. In ASTM B117 salt spray test at 1000 hours of exposure, Quik Guard coating has an average 1.9% red rust.

Double-Barrier Coating

The Simpson Strong‑Tie® double-barrier coating is a proprietary two-layer coating that provides a level of corrosion protection that is equivalent to ASTM A153 hot-dip galvanization in most non-marine exposures.

Class D Hot-Dip Galvanized, ASTM A153

Hot-dip galvanization that meets the standards of ASTM A153, Class D. Hot-dip galvanized fasteners have a minimum of 1.0 oz/ft2 of zinc coating. Hot-dip galvanized fasteners are in compliance with the 2006, 2009, and 2012 International Building Code and the 2006, 2009, and 2012 International Residential Code.

Class 55 Mechanically Galvanized, ASTM B695

Mechanically-applied zinc in accordance with ASTM B695, Class 55 with a supplementary overcoat. Mechanically galvanized, Class 55 Mechanically galvanized screws are in compliance with the 2006, 2009, and 2012 International Residential Code.

N2000® Mechanically Galvanized

Mechanically applied proprietary zinc coating with supplementary overcoat. In ASTM B117 salt spray tests at 1000 hours of exposure, mechanical galvanization has an average 15% red rust.

C-3 Mechanically Galvanized

Mechanically-applied zinc with a minimum of 20% tin in accordance with Australian Standard AS3566.2. In ASTM B117 Salt spray after 1000 hours of exposure, C3 mechanically galvanized has an average 1.9% red rust.

Teal-Arrow Icon

This icon identifies coated fasteners that Simpson Strong‑Tie classifies as possessing a medium level of corrosion resistance, making them suitable for use in some corrosive environments and with some preservative-treated woods. For applications in higher-exposure applications, Type-300 series stainless steel fasteners should be considered for superior corrosion resistance. Please see Fastener Corrosion Information and Minimum Coating or Material Recommendation before selecting a fastener for a specific application.

High Level of Corrosion Resistance

Types 304 and 305 Stainless Steel

Types 304 and 305 stainless steels are nickel chromium austenitic grades of stainless steel and are inherently non-magnetic. Fasteners made from Types 304 and 305 stainless steel are compliant with the 2006, 2009, and 2012 International Building Code, section 2304.9.5 and the International Residential Code 2006, Section R319.3 and 2009 and 2012, section R317.3.

Types 304 and 305 stainless steel are not hardened by heat treatment and provide very good corrosion protection.

Severe Level of Corrosion Resistance

Type 316 Stainless Steel

Type 316 stainless steel is a nickel chromium austenitic grade of stainless steel with 2-3% molybdenum and is inherently non-magnetic. Fasteners made from Type 316 stainless steel are compliant with the 2006, 2009, and 2012 International Building Code, section 2304.9.5 and the International Residential Code 2006, Section R319.3 and 2009 and 2012, section R317.3.

Type 316 stainless steel is not hardened by heat treatment and provides the highest level of corrosion protection available, especially in environments with chlorides.

Class C Hot-Dip Galvanized, ASTM A153

Hot-dip galvanization that meets the requirements of ASTM A153, Class C. Hot-dip galvanized fasteners have a minimum average of 1.25 oz/ft2 of zinc coating. Hot-dip galvanized fasteners are compliant with the 2006 and 2012 International Residential Code (R319.3), 2006 International Building Code (2304.9.5) 2009 and 2012 International Residential Code (R317.3) and the 2009 International Building Code (2304.9.5.1).

Copper

The copper used for the manufacture of fasteners contains a minimum of 98% copper in accordance with ASTM F1667. Fasteners made from Copper are compliant with the 2006, 2009, and 2012 International Building Code, section 2304.9.5 and the International Residential Code 2006, Section R319.3 and 2009 and 2012, section R317.3.

Silicon Bronze

Silicon Bronze is a copper alloy with silicon used as an alloying element. Fasteners made from Silicon Bronze are compliant with the 2006, 2009, and 2012 International Building Code, section 2304.9.5 and the International Residential Code 2006, Section R319.3 and 2009 and 2012, section R317.3.

General note about salt spray testing:

Salt spray testing in accordance with ASTM B117 is not intended to represent real-world corrosion performance of fastener coatings. It should only be used for comparative evaluation between like products. Many variables may affect the outcome of the salt spray test such as base material, fastener features, coating and the material where it is installed.

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