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materials-and-coatings-for-fasteners

Materials and Coatings Available for Fasteners

<h1>Materials and Coatings Available for Fasteners</h1>
<div class="notice">
  <div class="icon icon-info"></div>
  <div class="notice__content">
    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
    <a
      href="/products/product-use-information/corrosion-information/general-corrosion-risks"
      >General Corrosion Risks</a
    >,
    <a
      href="/products/product-use-information/corrosion-information/guidelines-for-selecting-proper-materials-and-coatings"
      >Guidelines for Selecting the Proper Materials and Coatings</a
    >,
    <a
      href="/products/connectors/wood-construction-connectors/technical-notes/corrosion-info/materials-and-coatings"
      >Materials and Coatings Available &mdash; Connectors</a
    >, and Materials and Coatings Available &mdash; Fasteners for more
    information on selecting products based on corrosion resistance.
  </div>
</div>

<p>
  Simpson Strong-Tie Company Inc. welcomes the opportunity to provide assistance
  in fastener selection; please call (800) 999-5099 or visit
  <a href="https://www2.strongtie.com/askman.html">Ask Simpson</a> online in the
  event that technical support is needed.
</p>
<h2>Corrosion Resistance Classifications</h2>
<h3>Low Level of Corrosion Resistance</h3>

<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Clear Zinc</h4>
    <p>
      Electroplated clear zinc is applied in accordance with ASTM F1941. In the
      ASTM B117 salt spray test, clear zinc provides 12 to 24 hours of corrosion
      protection before the first appearance of red rust depending on coating
      thickness.
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Electrocoating (E-Coat<sup>&trade;</sup>)</h4>
    <p>
      Electrocoat utilizes electrical current to deposit the coating material
      onto the fastener. After application, the coating is oven cured.
      Electrocoat is intended for dry, low corrosion applications.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Gray Phosphate</h4>
    <p>
      Gray phosphate provides a minimum level of corrosion resistance and is
      intended for dry, low corrosion applications.
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Black Phosphate</h4>
    <p>
      Black phosphate provides a minimum level of corrosion resistance and is
      intended for dry, low corrosion applications.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Yellow Zinc</h4>
    <p>
      Electroplated zinc applied in accordance with ASTM F1941. In the ASTM B117
      salt spray test, yellow zinc provides at least 24 hours of corrosion
      protection before the first appearance of red rust.
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Class 1 Zinc Electroplate</h4>
    <p>
      Electroplated zinc applied in accordance with ASTM A641, Class 1. This is
      an electroplated zinc coating that provides a low level of corrosion
      resistance. The Class 1 coating has no specified red rust performance
      criteria in the B117 salt spray test.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Type 410 Stainless Steel</h4>
    <p>
      Type 410 stainless steel is a low-carbon martensitic grade of stainless
      steel that can be hardened and is inherently magnetic. This material
      provides corrosion resistance in mild atmospheres and many mild chemical
      environments.<br />
      See
      <a href="#passivation">Passivation of Stainless-Steel Fasteners</a>
      below.*
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Coated Zinc</h4>
    <p>
      This coating system consists of an electroplated zinc base layer with an
      E-Coat top coat. It provides corrosion resistance that is adequate for low
      corrosion environments. In ASTM B117 salt spray testing at 500 hours of
      exposure, fasteners with this coating have an average red rust of less
      than 5%.
    </p>
  </div>
</div>


<h3>Medium Level of Corrosion Resistance</h3>

<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Quik Guard<sup>&reg;</sup> Coating</h4>
    <p>
      Quik Guard is a proprietary coating that consists of an electroplated zinc
      base layer and a system of organic top coats. It provides corrosion
      resistance equivalent to hot-dip galvanization (ASTM A153, Class D) in
      some exposures. In ASTM B117 salt spray testing at 1,000 hours of
      exposure, fasteners with the Quik Guard coating have average red rust less
      than 2%.
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Double-Barrier Coating</h4>
    <p>
      The Simpson Strong-Tie Double Barrier coating is a proprietary coating
      that provides a level of corrosion resistance that is equivalent to
      hot-dip galvanization (ASTM A153, Class D) in most non-marine
      environments.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Class D Hot-Dip Galvanized, ASTM A153</h4>
    <p>
      The Class D hot-dip galvanization is a coating that meets the requirements
      of ASTM A153, Class D, which is a minimum average of 1.0 oz/ft<sup>2</sup>
      [305 g/m<sup>2</sup>] of zinc applied by a hot-dip process. Hot-dip
      galvanized fasteners are compliant with the 2012 and 2015 IBC and IRC.
    </p>
  </div>

  <div class="col-md-6 col-sm-6">
    <h4>Class 55 Mechanically Galvanized, ASTM B695</h4>
    <p>
      This is a mechanically-applied zinc coating that meets the requirements of
      ASTM B695, Class 55, which is a minimum average thickness of 55 microns
      with a supplementary overcoat. Screws with a Class 55 coating meet the
      requirements for use in preservative-treated and fire-retardant-treated
      wood as stated in the 2012 and 2015 IRC.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>N2000<sup>&reg;</sup> Mechanically Galvanized</h4>
    <p>
      This is a mechanically-applied proprietary zinc coating with a
      supplementary overcoat. In the ASTM B117 salt spray test at 1000 hours of
      exposure, fasteners with the N2000 coating exhibit average red rust less
      than 15%.
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>C-3 Mechanically Galvanized</h4>
    <p>
      A mechanically-applied coating that is zinc with a minimum of 20% tin in
      accordance with Australian Standard AS3566.2. In the ASTM B117 salt spray
      test at 1,000 hours of exposure, fasteners with the C3 coating exhibit
      average red rust of less than 2%.
    </p>
  </div>
</div>


<h3>High Level of Corrosion Resistance</h3>

<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Types 304 and 305 Stainless Steel</h4>
    <p>
      Types 304 and 305 stainless steels are nickel-chromium austenitic grades
      of stainless steel. Types 304 and 305 stainless steels are not hardened by
      heat treatment and are inherently nonmagnetic.
    </p>
    <p>
      They provide very good corrosion resistance and are suitable for use in
      many corrosive environments. Fasteners made from Types 304 and 305
      stainless steels are compliant with the 2012 and 2015 IBC and IRC.<br />
      See
      <a href="#passivation">Passivation of Stainless-Steel Fasteners</a>
      below.*
    </p>
  </div>
  
</div>


<h3>Severe Level of Corrosion Resistance</h3>
<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Type 316 Stainless Steel</h4>
    <p>
      Type 316 stainless steel is a nickel-chromium austenitic grade of
      stainless steel with 2-3% Molybdenum. Type 316 stainless steel is not
      hardened by heat treatment and is inherently nonmagnetic. It provides a
      level of corrosion protection suitable for severe environments, especially
      environments with chlorides. Type 316 stainless-steel fasteners are
      compliant with the 2012 and 2015 IBC and IRC.<br />
      See
      <a href="#passivation">Passivation of Stainless-Steel Fasteners</a>
      below.*
    </p>
  </div>
  <div class="col-md-6 col-sm-6">
    <h4>Class C Hot-Dip Galvanized, ASTM A153</h4>
    <p>
      Class C hot-dip galvanization is a coating that meets the requirements of
      ASTM A153, Class C, which is a minimum average of 1.25 oz/ft<sup>2</sup>
      [381 g/m<sup>2</sup>] of zinc applied by a hot-dip process. Hot-dip
      galvanized fasteners are compliant with the 2012 and 2015 IBC and IRC.
    </p>
  </div>
</div>


<div class="row">
  <div class="col-md-6 col-sm-6">
    <h4>Copper</h4>
    <p>
      Copper wire used for the manufacture of fasteners is in compliance with
      the material specifications of ASTM F1667. Copper fasteners meet the
      requirements for use in preservative-treated and fire-retardant-treated
      wood as stated in the 2012 and 2015 IBC and IRC. Compatibility with
      proprietary wood treatment chemicals should be verified against applicable
      evaluation reports.
    </p>
  </div>
</div>


<div id="passivation" class="notice notice--success notice--alt">
  <div class="notice__content">
    <h4>* Passivation of Stainless-Steel Fasteners</h4>
    <p>
      Stainless steels are designed to naturally self-passivate by forming a
      chromium oxide layer. Corrosion resistance of some stainless-steel
      fasteners is enhanced by a post-fabrication passivation process. The
      passivation process uses an acid bath to strip free iron from the surface
      and an oxidizer to force conversion of the surface chromium to the oxide
      form.
    </p>
  </div>
</div>


<div class="notice">
  <div class="icon icon-info"></div>
  <div class="notice__content">
    <h4>General Note About Salt Spray Testing</h4>
    <p>
      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.
    </p>
  </div>
</div>

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