ASTM A123/A123M-01

    Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products


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    1. Scope

    1.1 This specification covers the requirements for zinc coating (galvanizing) by the hot-dip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.

    1.2 This specification covers both unfabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal).

    Note 1--This specification covers those products previously addressed in Specifications A123-78 and A386-78.

    1.3 This specification does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines, or to steel less than 22 gage (0.0299 in.) (0.76 mm) thick.

    1.4 The galvanizing of hardware items that are to be centrifuged or otherwise handled to remove excess zinc (such as bolts and similar threaded fasteners, castings and rolled, pressed and forged items) shall be in accordance with Specification A153/A153M.

    1.5 This specification is applicable to orders in either inch-pound units (as A123) or SI units (as A123M). Inch-pound units and SI units are not necessarily exact equivalents. Within the text of this specification and where appropriate, SI units are shown in parentheses. Each system shall be used independently of the other without combining values in any way. In the case of orders in SI units, all testing and inspection shall be done using the metric equivalent of the test or inspection method as appropriate. In the case of orders in SI units, such shall be stated to the galvanizer when the order is placed.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A47/A47M Specification for Ferritic Malleable Iron Castings

    A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings

    A143/A143M Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement

    A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

    A384/A384M Practice for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assemblies

    A385 Practice for Providing High-Quality Zinc Coatings (Hot-Dip)

    A767/A767M Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement

    A780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings

    A902 Terminology Relating to Metallic Coated Steel Products

    B6 Specification for Zinc

    B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    B960 Specification for Prime Western Grade-Recycled (PWG-R) Zinc

    E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 30102204(Steel plate); 31132100(Steel forgings)


    Referencing This Standard

    DOI: 10.1520/A0123_A0123M-01

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    Citation Format

    ASTM A123 / A123M-01, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products, ASTM International, West Conshohocken, PA, 2001, www.astm.org

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