# HS code 7325.91: Grinding balls and similar articles for mills

> HS code 7325.91 covers grinding balls and similar articles for mills, other than those classified in 7325.99. It sits in heading 73.25 (other cast articles of iron or steel) in chapter 73 (articles of iron or steel). Other goods of heading 73.25 are classified under 7325.10 (of non-malleable cast iron) and 7325.99 (other, other). National tariff lines under 7325.91 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/732591
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 73](https://border.bot/hs-codes/73) / [73.25](https://border.bot/hs-codes/7325) / [7325.91](https://border.bot/hs-codes/732591)

## Key facts

- HS code: 7325.91
- Covers: Grinding balls and similar articles for mills
- Heading: [73.25: Other cast articles of iron or steel](https://border.bot/hs-codes/7325)
- Chapter: [73: Articles of iron or steel](https://border.bot/hs-codes/73)
- Edition: HS2022
- Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/732591)

## What this code covers

HS code 7325.91 covers grinding balls and similar articles for mills, other than those classified in 7325.99.

The legal text of the subheading is “Other: Grinding balls and similar articles for mills”, read under “Other”, in HS2022.

## What it doesn’t cover

Other goods of heading 73.25 are classified under 7325.10 (of non-malleable cast iron) and 7325.99 (other, other).

- [7325.10](https://border.bot/hs-codes/732510) Of non-malleable cast iron
- [7325.99](https://border.bot/hs-codes/732599) Other: Other

## How it is structured

7325.91 is a six-digit subheading. Its first two digits, 73, are the chapter; the first four, 7325, are heading 73.25; the last two, 91, identify the subheading within the heading.

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

- Chapter 73: Articles of iron or steel
- Heading 73.25: Other cast articles of iron or steel
- Within the heading: Other
- Subheading 7325.91: Grinding balls and similar articles for mills

## In other countries

National tariff lines under 7325.91 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/732591): 1 line, used by 1 other country

- Previous subheading: [7325.10](https://border.bot/hs-codes/732510) Of non-malleable cast iron
- Next subheading: [7325.99](https://border.bot/hs-codes/732599) Other: Other

## Frequently asked questions

### What does HS code 7325.91 cover?

HS code 7325.91 covers grinding balls and similar articles for mills, other than those classified in 7325.99.

### Which heading and chapter is HS code 7325.91 in?

HS code 7325.91 is in heading 73.25 (other cast articles of iron or steel) in chapter 73 (articles of iron or steel).

### Where are goods of heading 73.25 classified when 7325.91 doesn’t fit?

Other goods of heading 73.25 are classified under 7325.10 (of non-malleable cast iron) and 7325.99 (other, other).

### Which countries’ tariffs list national lines under HS code 7325.91?

National tariff lines under 7325.91 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/732591.json