Heading 8431 · Parts suitable for use solely or principally with the machinery of headings…
8431.43
Parts for boring or sinking machinery of subheading 8430.41 or 8430.49:
Official notices
Actions of the President, the USTR or U.S. Customs and Border Protection (CBP) that name this code.
- Jun 1, 2026 · The White House Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper Into the United States
- Apr 2, 2026 · The White House Strengthening Actions Taken To Adjust Imports of Aluminum, Steel, and Copper Into the United States
- Aug 19, 2025 · Commerce Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions Process
Mentioned in Chapter 99
The parts of Chapter 99, in the 2026 HTS Revision 22, that list HTS 8431.43, a broader code that includes it, or a narrower code within it.
| U.S. note | Excerpt | Headings that refer to it |
|---|---|---|
| U.S. note 16(c)(vii) | (vii) Derivative steel articles: [Compiler’s note: List may begin on a subsequent page; read numbers from left to right.] | 9903.82.01, 9903.82.03, 9903.82.05, 9903.82.09, 9903.82.16 |
| U.S. note 20(b) | (b) Heading 9903.88.01 applies to all products of China that are classified in the following 8-digit subheadings, except products of China granted an exclusion by the U.S. Trade Representative and provided for in: (1) heading 9903.88.05… | 9903.88.01 |
| U.S. note 20(mmm)(4) | (4) Cement retainer assemblies with diameter of 4.5 cm or more but not exceeding 51 cm and length of 30.5 cm or more but not exceeding 72 cm, composed of cylindrical cast iron components, nitrile rubber seal and brass back-up rings,… | 9903.88.60 |
| U.S. note 20(q)(88) | (88) Bridge plug assemblies for oil and gas boring or sinking machinery, other than for offshore oil and natural gas drilling and production platforms (described in statistical reporting number | 9903.88.14 |
| U.S. note 20(x)(22) | (22) Cement retainer assemblies with diameter of 4.5 cm or more but not exceeding 51 cm and length of 30.5 cm or more but not exceeding 72 cm, composed of cylindrical cast iron components, nitrile rubber seal and brass back-up rings,… | 9903.88.19 |
Being listed is not owing a duty. A note may list goods that a measure leaves out; whether a heading applies depends on the origin, the date and the product; and the measures on all the goods of a country list no code at all. The calculator says what applies.
In the tariff
- 8431Parts suitable for use solely or principally with the machinery of headings 8425 to 8430
- Of machinery of heading 8426, 8429 or 8430
- 8431.43Parts for boring or sinking machinery of subheading 8430.41 or 8430.49
- 8431.43.40.00Of offshore oil and natural gas drilling and production platformsFree
- 8431.43.80OtherFree
- Of oil and gas field machinery
- 8431.43.80.20Tool joints, whether or not forged
- 8431.43.80.40Drill pipe fitted with tool joints
- 8431.43.80.60Other
- 8431.43.80.90Of other boring or sinking machinery