WHAT IS THE GALVANIZED COATING THICKNESS FOR ASTM A53/ASTM A123‌/ASTM A153

 

WHAT IS THE GALVANIZED COATING THICKNESS FOR ASTM A53/ASTM A123‌/ASTM A153

Steel pipe Zinc coating thickness requirements vary significantly across these three standards because they apply to different types of steel products.

ASTM A53 (Steel Pipe)

This standard specifically applies to steel pipe and primarily defines requirements by coating weight per unit area rather than thickness grades.

  • Average of specimens: Minimum 1.8 oz/ft2(550 g/m2)

  • Individual specimen: Minimum  1.6 oz/ft2(490 g/m2)

  • Thickness Equivalent: The  1.8 oz/ft2 requirement is roughly equal to 3.4 mils (86 microns)

    ASTM A123 (Fabricated Products)

    This standard covers structural shapes, plates, and tubing. Requirements are based on the Material Category and the thickness of the steel.

    Material Category               Steel Thickness Range (mm)               Min. Avg. Coating Grade (um)            Equivalent (mil)

    Structural Shapes                        ≥6.4                                                                          100                                                          3.9

                                                             3.2 to 6.4                                                       75                                                   2.9

     Plate                                               ≥6.4                                                                          100                                                          3.9

                                                             3.2 to 6.4                                                       75                                                   2.9

    Pipe&Tubing                                  ≥6.4                                                                          75                                                           2.9

                                                             3.2 to 6.4                                                       75                                                   2.9

                                                             1.6 to 3.2                                                        45                                                   1.8

    No Maximum: Values listed are minimums; there is no specified maximum thickness.

    • Specimen Minimum: Individual specimens may be one coating grade lower than the required average for the sample.

    ASTM A153 (Hardware & Fasteners)

    This standard applies to small parts and hardware that are typically centrifuged (spun) to remove excess zinc.

    Class                                       Description                                                       Min. Avg. Thickness                            Min. Individual

    Class A                                  Castings (Steel, Malleable Iron)                               3.4                                                        3.1

    Class B-1                               Rolled Items≥3/16''≥15'' long                                          3.4                                                             3.1

    Class B-2                              Rolled Items≥3/16''≥15'' long                                          2.6                                                             2.1

    Class B-3                             any thickness ≤15'' long                                                  2.2                                                              1.9

    Class C                                 Fasteners≥3/8'' Diameter; Washers 3/16''-1/4''            2.1                                                               1.7

    Class D                                 Fasteners≥3/8'' Diameter; Washers ≤3/16''                   1.7                                                              1.4

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