# United States tariff lines under HS 8431.43

> The United States tariff splits HS 8431.43 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 8426, 8429 or 8430: Parts for boring or sinking machinery of subheading 8430 41 or 8430 49) into 5 national lines: 8431.43.40.00 (of offshore oil and natural gas drilling and production platforms), 8431.43.80.20 (tool joints, whether or not forged), 8431.43.80.40 (drill pipe fitted with tool joints), 8431.43.80.60 (other) and 1 other. Every United States line under 8431.43 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/843143
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8431.43](https://border.bot/countries/united-states/hs-codes/843143)

## Key facts

- HS subheading: [8431.43](https://border.bot/hs-codes/843143)
- Duty (MFN): Free
- National lines: 5
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8431.43

The United States tariff splits HS 8431.43 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 8426, 8429 or 8430: Parts for boring or sinking machinery of subheading 8430 41 or 8430 49) into 5 national lines: 8431.43.40.00 (of offshore oil and natural gas drilling and production platforms), 8431.43.80.20 (tool joints, whether or not forged), 8431.43.80.40 (drill pipe fitted with tool joints), 8431.43.80.60 (other) and 1 other.

Every United States line under 8431.43 is free of general (MFN) duty.

- [8431.43.40.00](https://border.bot/countries/united-states/hs-codes/8431434000) Of machinery of heading 8426, 8429 or 8430, Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, Of offshore oil and natural gas drilling and production platforms. Duty (MFN): free
- [8431.43.80.20](https://border.bot/countries/united-states/hs-codes/8431438020) Of machinery of heading 8426, 8429 or 8430, Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, Other, Of oil and gas field machinery, Tool joints, whether or not forged. Duty (MFN): free
- [8431.43.80.40](https://border.bot/countries/united-states/hs-codes/8431438040) Of machinery of heading 8426, 8429 or 8430, Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, Other, Of oil and gas field machinery, Drill pipe fitted with tool joints. Duty (MFN): free
- [8431.43.80.60](https://border.bot/countries/united-states/hs-codes/8431438060) Of machinery of heading 8426, 8429 or 8430, Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, Other, Of oil and gas field machinery, Other. Duty (MFN): free
- [8431.43.80.90](https://border.bot/countries/united-states/hs-codes/8431438090) Of machinery of heading 8426, 8429 or 8430, Parts for boring or sinking machinery of subheading 8430.41 or 8430.49, Other, Of other boring or sinking machinery. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 8431.43 yet.

- [The Harmonized System text for 8431.43](https://border.bot/hs-codes/843143)

- Previous subheading: [8431.42](https://border.bot/countries/united-states/hs-codes/843142) Parts suitable for use solely or principally with the machinery of headings 8425 to 8430
- Next subheading: [8431.49](https://border.bot/countries/united-states/hs-codes/843149) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8431.43?

The United States tariff splits HS 8431.43 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 8426, 8429 or 8430: Parts for boring or sinking machinery of subheading 8430 41 or 8430 49) into 5 national lines: 8431.43.40.00 (of offshore oil and natural gas drilling and production platforms), 8431.43.80.20 (tool joints, whether or not forged), 8431.43.80.40 (drill pipe fitted with tool joints), 8431.43.80.60 (other) and 1 other.

### What is the duty on HS 8431.43 in the United States?

Every United States line under 8431.43 is free of general (MFN) duty.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/843143.json