# HS code 8420.91: Parts, cylinders

> HS code 8420.91 covers parts, cylinders. It sits in heading 84.20 (calendering or other rolling machines, other than for metals or glass, and cylinders therefor) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.20 are classified under 8420.10 (calendering or other rolling machines) and 8420.99 (parts, other). National tariff lines under 8420.91 are live on border.bot for the United States (3 lines, also used by 1 other country).

Source: https://border.bot/hs-codes/842091
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 84](https://border.bot/hs-codes/84) / [84.20](https://border.bot/hs-codes/8420) / [8420.91](https://border.bot/hs-codes/842091)

## Key facts

- HS code: 8420.91
- Covers: Parts, cylinders
- Heading: [84.20: Calendering or other rolling machines, other than for metals or glass, and cylinders therefor](https://border.bot/hs-codes/8420)
- 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 3 lines](https://border.bot/countries/united-states/hs-codes/842091)

## What this code covers

HS code 8420.91 covers parts, cylinders.

The legal text of the subheading is “Parts: Cylinders”, read under “Parts”, in HS2022.

## What it doesn’t cover

Other goods of heading 84.20 are classified under 8420.10 (calendering or other rolling machines) and 8420.99 (parts, other).

- [8420.10](https://border.bot/hs-codes/842010) Calendering or other rolling machines
- [8420.99](https://border.bot/hs-codes/842099) Parts: Other

## How it is structured

8420.91 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8420, are heading 84.20; the last two, 91, 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 84.20: Calendering or other rolling machines, other than for metals or glass, and cylinders therefor
- Within the heading: Parts
- Subheading 8420.91: Cylinders

## In other countries

National tariff lines under 8420.91 are live on border.bot for the United States (3 lines, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/842091): 3 lines, used by 1 other country

- Previous subheading: [8420.10](https://border.bot/hs-codes/842010) Calendering or other rolling machines
- Next subheading: [8420.99](https://border.bot/hs-codes/842099) Parts: Other

## Frequently asked questions

### What does HS code 8420.91 cover?

HS code 8420.91 covers parts, cylinders.

### Which heading and chapter is HS code 8420.91 in?

HS code 8420.91 is in heading 84.20 (calendering or other rolling machines, other than for metals or glass, and cylinders therefor) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof).

### Where are goods of heading 84.20 classified when 8420.91 doesn’t fit?

Other goods of heading 84.20 are classified under 8420.10 (calendering or other rolling machines) and 8420.99 (parts, other).

### Which countries’ tariffs list national lines under HS code 8420.91?

National tariff lines under 8420.91 are live on border.bot for the United States (3 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/842091.json