# United States tariff line 8431.43.40.00: Of offshore oil and natural gas drilling and production platforms

> In the United States tariff, line 8431.43.40.00 covers 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, of offshore oil and natural gas drilling and production platforms. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 8431.43 in heading 84.31 (chapter 84).

Source: https://border.bot/countries/united-states/hs-codes/8431434000
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) / [8431.43.40.00](https://border.bot/countries/united-states/hs-codes/8431434000)

## Key facts

- Tariff line: 8431.43.40.00
- Covers: 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, of offshore oil and natural gas drilling and production platforms
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [8431.43](https://border.bot/hs-codes/843143)

## What this line covers

In the United States tariff, line 8431.43.40.00 covers 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, of offshore oil and natural gas drilling and production platforms.

Its legal text is “Of offshore oil and natural gas drilling and production platforms”, read under “Of machinery of heading 8426, 8429 or 8430” and “Parts for boring or sinking machinery of subheading 8430.41 or 8430.49”.

## How it is structured

It falls under HS subheading 8431.43 in heading 84.31 (chapter 84). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof
- Heading 84.31: Parts suitable for use solely or principally with the machinery of headings 8425 to 8430
- Subheading 8431.43: Of machinery of heading 8426, 8429 or 8430
- Within the subheading: Parts for boring or sinking machinery of subheading 8430.41 or 8430.49
- Line 8431.43.40.00: Of offshore oil and natural gas drilling and production platforms

## Duty

Goods under this line enter free of general (MFN) duty.

## 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)

## Other lines under 8431.43

- [8431.43.80.20](https://border.bot/countries/united-states/hs-codes/8431438020) Tool joints, whether or not forged
- [8431.43.80.40](https://border.bot/countries/united-states/hs-codes/8431438040) Drill pipe fitted with tool joints
- [8431.43.80.60](https://border.bot/countries/united-states/hs-codes/8431438060) Other
- [8431.43.80.90](https://border.bot/countries/united-states/hs-codes/8431438090) Of other boring or sinking machinery

- Previous line: [8431.42.00.00](https://border.bot/countries/united-states/hs-codes/8431420000) Bulldozer or angledozer blades
- Next line: [8431.43.80.20](https://border.bot/countries/united-states/hs-codes/8431438020) Tool joints, whether or not forged

## Frequently asked questions

### What does tariff line 8431.43.40.00 cover in the United States tariff?

In the United States tariff, line 8431.43.40.00 covers 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, of offshore oil and natural gas drilling and production platforms.

### What is the general (MFN) duty on 8431.43.40.00 in the United States?

Goods under this line enter 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/8431434000.json