# HS code 8459.31: Other boring-milling machines, numerically controlled

> HS code 8459.31 covers other boring-milling machines, numerically controlled. It sits in heading 84.59 (machine-tools (including way-type unit head machines) for drilling, boring, milling, threading or tapping by removing metal, other than lathes (including turning centres) of heading 84.58) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.59 are classified under 8459.10 (way-type unit head machines), 8459.21 (other drilling machines, numerically controlled), 8459.29 (other drilling machines, other), 8459.39 (other boring-milling machines, other) or 7 others.

Source: https://staging.border.bot/hs-codes/845931
Last updated: 13 October 2026

[HS codes](https://staging.border.bot/hs-codes) / [Chapter 84](https://staging.border.bot/hs-codes/84) / [84.59](https://staging.border.bot/hs-codes/8459) / [8459.31](https://staging.border.bot/hs-codes/845931)

## Key facts

- HS code: 8459.31
- Covers: Other boring-milling machines, numerically controlled
- Heading: [84.59: Machine-tools (including way-type unit head machines) for drilling, boring, milling, threading or tapping by removing metal, other than lathes (including turning centres) of heading 84.58](https://staging.border.bot/hs-codes/8459)
- Chapter: [84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof](https://staging.border.bot/hs-codes/84)
- Edition: HS2022
- Duty rates: [Set by each country’s tariff](https://staging.border.bot/countries)

## What this code covers

HS code 8459.31 covers other boring-milling machines, numerically controlled.

The legal text of the subheading is “Other boring-milling machines: Numerically controlled”, read under “Other boring-milling machines”, in HS2022.

## What it doesn’t cover

Other goods of heading 84.59 are classified under 8459.10 (way-type unit head machines), 8459.21 (other drilling machines, numerically controlled), 8459.29 (other drilling machines, other), 8459.39 (other boring-milling machines, other) or 7 others.

- [8459.10](https://staging.border.bot/hs-codes/845910) Way-type unit head machines
- [8459.21](https://staging.border.bot/hs-codes/845921) Other drilling machines: Numerically controlled
- [8459.29](https://staging.border.bot/hs-codes/845929) Other drilling machines: Other
- [8459.39](https://staging.border.bot/hs-codes/845939) Other boring-milling machines: Other
- [8459.41](https://staging.border.bot/hs-codes/845941) Other boring machines: Numerically controlled
- [8459.49](https://staging.border.bot/hs-codes/845949) Other boring machines: Other
- [8459.51](https://staging.border.bot/hs-codes/845951) Milling machines, knee-type: Numerically controlled
- [8459.59](https://staging.border.bot/hs-codes/845959) Milling machines, knee-type: Other
- [8459.61](https://staging.border.bot/hs-codes/845961) Other milling machines: Numerically controlled
- [8459.69](https://staging.border.bot/hs-codes/845969) Other milling machines: Other
- [8459.70](https://staging.border.bot/hs-codes/845970) Other threading or tapping machines

## How it is structured

8459.31 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8459, are heading 84.59; 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 84.59: Machine-tools (including way-type unit head machines) for drilling, boring, milling, threading or tapping by removing metal, other than lathes (including turning centres) of heading 84.58
- Within the heading: Other boring-milling machines
- Subheading 8459.31: Numerically controlled

## In other countries

No national tariff lines under 8459.31 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 8459.31 at six digits and add their own digits after it.

- Previous subheading: [8459.29](https://staging.border.bot/hs-codes/845929) Other drilling machines: Other
- Next subheading: [8459.39](https://staging.border.bot/hs-codes/845939) Other boring-milling machines: Other

## Frequently asked questions

### What does HS code 8459.31 cover?

HS code 8459.31 covers other boring-milling machines, numerically controlled.

### Which heading and chapter is HS code 8459.31 in?

HS code 8459.31 is in heading 84.59 (machine-tools (including way-type unit head machines) for drilling, boring, milling, threading or tapping by removing metal, other than lathes (including turning centres) of heading 84.58) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof).

### Where are goods of heading 84.59 classified when 8459.31 doesn’t fit?

Other goods of heading 84.59 are classified under 8459.10 (way-type unit head machines), 8459.21 (other drilling machines, numerically controlled), 8459.29 (other drilling machines, other), 8459.39 (other boring-milling machines, other) or 7 others.

## Sources and updates

The Harmonized System legal text comes from border.bot release 1 (edition HS 2022), imported from a file, and has been live since 13 October 2026.

This page was last updated on 13 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://staging.border.bot/hs-codes/845931.json