8431.43.80.20—Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, tool joints, whether or not forgedGeneral
Free
Units
No.
Column 2
35%
Special
—
HTS 8431.43.80.20 is the U.S. Harmonized Tariff Schedule classification for Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, tool joints, whether or not forged. It's a 10-digit statistical line in Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof, Section XVI: Machinery and Mechanical Appliances; Electrical Equipment; Parts Thereof; Sound Recorders and Reproducers, Television Image and Sound Recorders and Reproducers, and Parts and Accessories of Such Articles, used by U.S. Customs and Border Protection to determine the duty rate at entry. 11 Chapter 99 tariff modifications currently stack on top of the base rate.
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Chapter 99 overlays that stack on the base rate
| Code | Authority | Rate |
|---|---|---|
| 9903.80.03 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.84 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.86 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.81.91 | section_232 | The duty provided in the applicable subheading + a duty of 50% upon the value of the steel content. |
| 9903.81.92 | section_232 | The duty provided in the applicable subheading. |
| 9903.81.98 | section_232 | The duty provided in the applicable subheading + 25% |
| 9903.82.05 | section_232 | 15% |
| 9903.82.13 | section_232 | 0% |
| 9903.82.15 | section_232 | 10% |
| 9903.88.01 | section_301 | The duty provided in the applicable subheading plus 25% |
| 9903.88.15 | section_301 | The duty provided in the applicable subheading + 7.5% |
HTS 8431.43.80.20 is the U.S. Harmonized Tariff Schedule classification for Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, tool joints, whether or not forged. It belongs to Chapter 84 of the HTSUS.
The general (Column 1) duty rate for HTS 8431.43.80.20 is Free. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
The Column 2 rate for HTS 8431.43.80.20 is 35%. This rate applies to imports from countries that do not have normal trade relations with the United States (currently Cuba and North Korea).
Yes — HTS 8431.43.80.20 is covered by section_232 provision 9903.80.03 (The duty provided in the applicable subheading + 25%). 10 additional overlays also touch this code. Open the code page for the full overlay stack with effective dates and country scopes.
No active AD/CVD orders currently flag HTS 8431.43.80.20 in Tandom's catalog. Tandom monitors Federal Register notices daily; a flag will appear here within 24h of any new order's publication.
Tandom guides relevant to this code
What the 178 active Section 301 exclusions cover, how to claim 9903.88.69 on an entry, and what changes when the November 10, 2026 deadline passes.
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How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
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