Heading 99039903.82.25
Articles of copper and derivative aluminum and steel articles with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 15 percent, as provided for in subdivisions (f) and (k) of U.S. note 16 to this subchapter
The U.S. notes it refers to
As the 2026 HTS Revision 22 writes them (official notes); each code opens its page. Whether this heading applies to goods depends on the origin, the date and the product: the calculator says it.
U.S. note 16(f)
(f) Except as provided for in headings 9903.82.12 and 9903.82.17, headings 9903.82.10 and 9903.82.11 apply to articles provided for in subdivisions (c)(ix)–(x) of this note that do not meet the requirements described in subdivision (e) of this note. Headings 9903.82.25 and 9903.82.26 apply to articles that meet the requirements of subdivision (k) of this note but do not meet the requirements described in subdivision (e) of this note. For articles for which the applicable column 1 duty rate is less than 15 percent, heading 9903.82.10 or 9903.82.25 applies and the sum of the column 1 duty rate and the additional ad valorem rate of duty is 15 percent ad valorem . For articles for which the applicable column 1 duty rate is 15 percent or higher, heading 9903.82.11 or 9903.82.26 applies.
U.S. note 16(k)
(k) Except as provided in heading 9903.85.68, headings 9903.82.23–9903.82.26 apply to parts classifiable in the provisions of subdivision (c)(vi)–(viii) of this note that are in chapters 84, 85, or 87 of the HTSUS that will be used exclusively in the manufacturing of agricultural equipment or fixed industrial equipment provided for in subdivision (c)(ix)–(x) of this note or mobile industrial equipment provided for in subdivision (c)(xi) of this note. Headings 9903.82.23–9903.82.26 do not apply to products of any country identified in general note 3(b).