CHAPTER 51 · LEGAL NOTES
Chapter 51
The 108 legal notes below govern classification under Chapter 51. 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: Throughout the tariff schedule: (a) "Wool" means the natural fiber grown by sheep or lambs; (b) "Fine animal hair" means the hair of alpaca, llama, vicuna, camel (including dromedary), yak, Angora, Tibetan, Kashmir or similar goats (but not common goats), rabbit (including Angora rabbit), hare, beaver, nutria or muskrat; and (c) "Coarse animal hair" means the hair of animals not mentioned above, excluding brush-making hair and bristles (heading 0502) and horsehair (heading 0511).
Additional U.S. notes
Note 1
Additional U.S. Note 1: For the purposes of headings 5101, 5102, 5103 and 5104, regarding any package containing wool or fine animal hair subject to different rates of duty, notwithstanding the rates of duty shown, the column 1 rate of duty is the highest column 1 rate applicable to any part of the contents of the package comprising not less than 10 percent thereof by weight and the column 2 rate of duty is the highest column 2 rate applicable to any part of the contents of the package comprising not less than 10 percent thereof by weight.
Note 18
Additional U.S. Note 18: 7¢/clean kg1/ kg kg 1 Unit Rates of Duty of Quantity Article Description Stat. Suffix Heading/ Subheading 1 2 General Special 5101 Wool, not carded or combed: Degreased, not carbonized:
Note 2
Additional U.S. Note 2: For the purposes of this chapter: (a) The term "clean kg" in the rate columns means kilogram of clean yield; (b) The term "clean yield," except for purposes of carbonized fibers, means the absolute clean content (i.e., all that portion of the merchandise which consists exclusively of wool or hair free of all vegetable and other foreign material, containing by weight 12 percent of moisture and 1.5 percent of material removable from the wool or hair by extraction with alcohol, and having an ash content of not over 0.5 percent by weight), less an allowance, equal by weight to 0.5 percent of the absolute clean content plus 60 percent of the vegetable matter present, but not exceeding 15 percent by weight of the absolute clean content, for wool or hair that would ordinarily be lost during commercial cleaning operations; (c) For purposes of carbonized fibers, the term "clean yield" means in the condition as entered;
Note 20
Additional U.S. Note 20: 6¢/clean kg1/ kg kg Other: Unimproved wool; other wool, not finer than
Note 20
Additional U.S. Note 20: 6¢/clean kg1/ kg kg Other: Unimproved wool; other wool, not finer than
Note 6
Additional U.S. Note 6: 9%1/ m 2 kg Other: Tapestry fabrics and upholstery fabrics of a weight exceeding 300 g/m2
footnote
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Classify under Chapter 51 with confidence
TariffLens applies the legal notes above automatically when classifying — citing the relevant note in every GRI reasoning chain.