# HS code 8401.20: Machinery and apparatus for isotopic separation, and parts thereof

> HS code 8401.20 covers machinery and apparatus for isotopic separation, and parts thereof. It sits in heading 84.01 (nuclear reactors; fuel elements (cartridges), non-irradiated, for nuclear reactors; machinery and apparatus for isotopic separation) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.01 are classified under 8401.10 (nuclear reactors), 8401.30 (fuel elements (cartridges), non-irradiated) or 8401.40 (parts of nuclear reactors). National tariff lines under 8401.20 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/840120
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 84](https://border.bot/hs-codes/84) / [84.01](https://border.bot/hs-codes/8401) / [8401.20](https://border.bot/hs-codes/840120)

## Key facts

- HS code: 8401.20
- Covers: Machinery and apparatus for isotopic separation, and parts thereof
- Heading: [84.01: Nuclear reactors; fuel elements (cartridges), non-irradiated, for nuclear reactors; machinery and apparatus for isotopic separation](https://border.bot/hs-codes/8401)
- Chapter: [84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof](https://border.bot/hs-codes/84)
- Edition: HS2022
- Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/840120)

## What this code covers

HS code 8401.20 covers machinery and apparatus for isotopic separation, and parts thereof.

The legal text of the subheading is “Machinery and apparatus for isotopic separation, and parts thereof”, in HS2022.

## What it doesn’t cover

Other goods of heading 84.01 are classified under 8401.10 (nuclear reactors), 8401.30 (fuel elements (cartridges), non-irradiated) or 8401.40 (parts of nuclear reactors).

- [8401.10](https://border.bot/hs-codes/840110) Nuclear reactors
- [8401.30](https://border.bot/hs-codes/840130) Fuel elements (cartridges), non-irradiated
- [8401.40](https://border.bot/hs-codes/840140) Parts of nuclear reactors

## How it is structured

8401.20 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8401, are heading 84.01; the last two, 20, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof
- Heading 84.01: Nuclear reactors; fuel elements (cartridges), non-irradiated, for nuclear reactors; machinery and apparatus for isotopic separation
- Subheading 8401.20: Machinery and apparatus for isotopic separation, and parts thereof

## In other countries

National tariff lines under 8401.20 are live on border.bot for the United States (1 line, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/840120): 1 line, used by 1 other country

- Previous subheading: [8401.10](https://border.bot/hs-codes/840110) Nuclear reactors
- Next subheading: [8401.30](https://border.bot/hs-codes/840130) Fuel elements (cartridges), non-irradiated

## Frequently asked questions

### What does HS code 8401.20 cover?

HS code 8401.20 covers machinery and apparatus for isotopic separation, and parts thereof.

### Which heading and chapter is HS code 8401.20 in?

HS code 8401.20 is in heading 84.01 (nuclear reactors; fuel elements (cartridges), non-irradiated, for nuclear reactors; machinery and apparatus for isotopic separation) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof).

### Where are goods of heading 84.01 classified when 8401.20 doesn’t fit?

Other goods of heading 84.01 are classified under 8401.10 (nuclear reactors), 8401.30 (fuel elements (cartridges), non-irradiated) or 8401.40 (parts of nuclear reactors).

### Which countries’ tariffs list national lines under HS code 8401.20?

National tariff lines under 8401.20 are live on border.bot for the United States (1 line, also used by 1 other country).

## Sources and updates

The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.

This page was last updated on 11 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.

Machine-readable: https://border.bot/hs-codes/840120.json