CHAPTER 73 · LEGAL NOTES
Chapter 73
The 279 legal notes below govern classification under Chapter 73. They are part of the official Harmonized Tariff Schedule and are cited verbatim in CBP rulings.
As of June 9, 2026
Chapter notes
Note 1
Chapter Note 1: In this chapter the expression "cast iron" applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1(d) to chapter 72.
Note 2
Chapter Note 2: In this chapter the word "wire" means hot- or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm.
Additional U.S. notes
Note 1
Additional U.S. Note 1: For the purposes of heading 7304 or 7306, the rate of duty "Free (C)" appearing in the "Special" subcolumn applies only to tubes and pipes with attached fittings, suitable for conducting gases or liquids.
Note 2
Additional U.S. Note 2: For the purposes of subheading 7307.19.30, the expression "ductile fittings" refers to fittings which contain over 2.5 percent carbon and over 0.02 percent of magnesium or of magnesium and cerium, by weight.
Statistical notes
Note 1
Statistical Note 1: For the purposes of statistical reporting numbers 7310.10.0005, 7310.29.0020 and 7310.29.0055, “refillable stainless steel kegs, whether or not pressurized” refers to cylindrical kegs for liquid beverages, each keg with a domed top and bottom and a single neck piece, designed for a coupler (valve) system and an extractor tube (spear) by which the keg can be cleaned, filled and dispense the liquid contents. Unit Rates of Duty of Quantity Article Description Stat. Suffix Heading/ Subheading 1 2 General Special Sheet piling of iron or steel, whether or not drilled, punched or made from assembled elements; welded angles, shapes and sections, of iron or steel: 7301
Note 12
Statistical Note 12: 7 mm or more but less than 35 kg Having a wall thickness of 19 mm 40 kg Having an outside diameter of
Note 12
Statistical Note 12: 7 mm or more but less than 50 kg Having a wall thickness of 19 mm 55 kg Having an outside diameter exceeding
Note 12
Statistical Note 12: 7 mm or more but less than 65 kg Having a wall thickness of 19 mm 70 kg Having an outside diameter exceeding
Note 38
Statistical Note 38: 1 mm or more but not exceeding
Note 38
Statistical Note 38: 1 mm or more but not exceeding
footnote
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Classify under Chapter 73 with confidence
TariffLens applies the legal notes above automatically when classifying — citing the relevant note in every GRI reasoning chain.