CHAPTER 81 · LEGAL NOTES
Chapter 81
The 64 legal notes below govern classification under Chapter 81. They are part of the official Harmonized Tariff Schedule and are cited verbatim in CBP rulings.
As of June 9, 2026
Additional U.S. notes
Note 1
Additional U.S. Note 1: Alloys of each of the base metals provided for in chapter 81 are metals in which the content of the respective base metal is, by weight, less than 99 percent, but not less than any other metallic element.
Note 13
Additional U.S. Note 13: 9¢/kg on molybdenum content + 1.9% Mo kg Bars and rods, other than those obtained simply by sintering, profiles, plates, sheets, strip and foil:
Note 14
Additional U.S. Note 14: 8¢/kg on magnesium content +
Note 2
Additional U.S. Note 2: For the purposes of subheading 8108.90.60, 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. Unit Rates of Duty of Quantity Article Description Stat. Suffix Heading/ Subheading 1 2 General Special Tungsten (wolfram) and articles thereof, including waste and scrap: 8101
Note 9
Additional U.S. Note 9: 1¢/kg on molybdenum content + 1.2% Mo kg Other: Unwrought molybdenum, including bars and rods
footnote
See 9903.91.01.
Applies to
See 9903.91.11.
Applies to
See 9903.88.03.
Applies to
See 9903.91.11.
Applies to
See 9903.91.11.
Applies to
See 9903.88.03.
Applies to
See 9903.91.01.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See additional U.S. note 2 to this chapter.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.91.01.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.90.09.
Applies to
See 9903.91.01.
Applies to
See 9903.88.03.
Applies to
See 9903.90.09.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
See 9903.88.03.
Applies to
Classify under Chapter 81 with confidence
TariffLens applies the legal notes above automatically when classifying — citing the relevant note in every GRI reasoning chain.