# United States tariff lines under HS 8431.20

> The United States tariff splits HS 8431.20 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 84.27) into 1 national line: 8431.20.00.00 (of machinery of heading 8427). Every United States line under 8431.20 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/843120
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) / [8431.20](https://border.bot/countries/united-states/hs-codes/843120)

## Key facts

- HS subheading: [8431.20](https://border.bot/hs-codes/843120)
- Duty (MFN): Free
- National lines: 1
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8431.20

The United States tariff splits HS 8431.20 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 84.27) into 1 national line: 8431.20.00.00 (of machinery of heading 8427).

Every United States line under 8431.20 is free of general (MFN) duty.

- [8431.20.00.00](https://border.bot/countries/united-states/hs-codes/8431200000) Of machinery of heading 8427. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 8431.20 yet.

- [The Harmonized System text for 8431.20](https://border.bot/hs-codes/843120)

- Previous subheading: [8431.10](https://border.bot/countries/united-states/hs-codes/843110) Parts suitable for use solely or principally with the machinery of headings 8425 to 8430
- Next subheading: [8431.31](https://border.bot/countries/united-states/hs-codes/843131) Parts suitable for use solely or principally with the machinery of headings 8425 to 8430

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8431.20?

The United States tariff splits HS 8431.20 (parts suitable for use solely or principally with the machinery of headings 8425 to 8430, of machinery of heading 84.27) into 1 national line: 8431.20.00.00 (of machinery of heading 8427).

### What is the duty on HS 8431.20 in the United States?

Every United States line under 8431.20 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/843120.json