# HS code 8412.31: Pneumatic power engines and motors, linear acting (cylinders)

> HS code 8412.31 covers pneumatic power engines and motors, linear acting (cylinders). It sits in heading 84.12 (other engines and motors) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.12 are classified under 8412.10 (reaction engines other than turbo-jets), 8412.21 (hydraulic power engines and motors, linear acting (cylinders)), 8412.29 (hydraulic power engines and motors, other), 8412.39 (pneumatic power engines and motors, other) or 2 others. National tariff lines under 8412.31 are live on border.bot for the United States (2 lines, also used by 1 other country).

Source: https://border.bot/hs-codes/841231
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 84](https://border.bot/hs-codes/84) / [84.12](https://border.bot/hs-codes/8412) / [8412.31](https://border.bot/hs-codes/841231)

## Key facts

- HS code: 8412.31
- Covers: Pneumatic power engines and motors, linear acting (cylinders)
- Heading: [84.12: Other engines and motors](https://border.bot/hs-codes/8412)
- 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 2 lines](https://border.bot/countries/united-states/hs-codes/841231)

## What this code covers

HS code 8412.31 covers pneumatic power engines and motors, linear acting (cylinders).

The legal text of the subheading is “Pneumatic power engines and motors: Linear acting (cylinders)”, read under “Pneumatic power engines and motors”, in HS2022.

## What it doesn’t cover

Other goods of heading 84.12 are classified under 8412.10 (reaction engines other than turbo-jets), 8412.21 (hydraulic power engines and motors, linear acting (cylinders)), 8412.29 (hydraulic power engines and motors, other), 8412.39 (pneumatic power engines and motors, other) or 2 others.

- [8412.10](https://border.bot/hs-codes/841210) Reaction engines other than turbo-jets
- [8412.21](https://border.bot/hs-codes/841221) Hydraulic power engines and motors: Linear acting (cylinders)
- [8412.29](https://border.bot/hs-codes/841229) Hydraulic power engines and motors: Other
- [8412.39](https://border.bot/hs-codes/841239) Pneumatic power engines and motors: Other
- [8412.80](https://border.bot/hs-codes/841280) Other
- [8412.90](https://border.bot/hs-codes/841290) Parts

## How it is structured

8412.31 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8412, are heading 84.12; the last two, 31, 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 84.12: Other engines and motors
- Within the heading: Pneumatic power engines and motors
- Subheading 8412.31: Linear acting (cylinders)

## In other countries

National tariff lines under 8412.31 are live on border.bot for the United States (2 lines, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/841231): 2 lines, used by 1 other country

- Previous subheading: [8412.29](https://border.bot/hs-codes/841229) Hydraulic power engines and motors: Other
- Next subheading: [8412.39](https://border.bot/hs-codes/841239) Pneumatic power engines and motors: Other

## Frequently asked questions

### What does HS code 8412.31 cover?

HS code 8412.31 covers pneumatic power engines and motors, linear acting (cylinders).

### Which heading and chapter is HS code 8412.31 in?

HS code 8412.31 is in heading 84.12 (other engines and motors) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof).

### Where are goods of heading 84.12 classified when 8412.31 doesn’t fit?

Other goods of heading 84.12 are classified under 8412.10 (reaction engines other than turbo-jets), 8412.21 (hydraulic power engines and motors, linear acting (cylinders)), 8412.29 (hydraulic power engines and motors, other), 8412.39 (pneumatic power engines and motors, other) or 2 others.

### Which countries’ tariffs list national lines under HS code 8412.31?

National tariff lines under 8412.31 are live on border.bot for the United States (2 lines, 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/841231.json