# United States tariff lines under HS 6804.21

> The United States tariff splits HS 6804.21 (other millstones, grindstones, grinding wheels and the like: Of agglomerated synthetic or natural diamond) into 4 national lines: 6804.21.00.10 (segments for circular sawblades, consisting of diamond agglomerated with metal), 6804.21.00.20 (articles consisting of a continuous rim segment of diamond agglomerated with metal, attached to circular plates of steel (whether or not attached to non-steel plates)), 6804.21.00.30 (articles consisting of multiple segments of diamond agglomerated with metal, attached to circular plates of steel, without cutting parts (whether or not attached to non-steel plates)) and 6804.21.00.90 (other). Every United States line under 6804.21 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/680421
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 68](https://border.bot/countries/united-states/hs-codes/68) / [6804.21](https://border.bot/countries/united-states/hs-codes/680421)

## Key facts

- HS subheading: [6804.21](https://border.bot/hs-codes/680421)
- Duty (MFN): Free
- National lines: 4
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 68: Articles of stone, plaster, cement, asbestos, mica or similar materials

## United States lines under 6804.21

The United States tariff splits HS 6804.21 (other millstones, grindstones, grinding wheels and the like: Of agglomerated synthetic or natural diamond) into 4 national lines: 6804.21.00.10 (segments for circular sawblades, consisting of diamond agglomerated with metal), 6804.21.00.20 (articles consisting of a continuous rim segment of diamond agglomerated with metal, attached to circular plates of steel (whether or not attached to non-steel plates)), 6804.21.00.30 (articles consisting of multiple segments of diamond agglomerated with metal, attached to circular plates of steel, without cutting parts (whether or not attached to non-steel plates)) and 6804.21.00.90 (other).

Every United States line under 6804.21 is free of general (MFN) duty.

- [6804.21.00.10](https://border.bot/countries/united-states/hs-codes/6804210010) Other millstones, grindstones, grinding wheels and the like, Of agglomerated synthetic or natural diamond, Segments for circular sawblades, consisting of diamond agglomerated with metal. Duty (MFN): free
- [6804.21.00.20](https://border.bot/countries/united-states/hs-codes/6804210020) Other millstones, grindstones, grinding wheels and the like, Of agglomerated synthetic or natural diamond, Articles consisting of a continuous rim segment of diamond agglomerated with metal, attached to circular plates of steel (whether or not attached to non-steel plates). Duty (MFN): free
- [6804.21.00.30](https://border.bot/countries/united-states/hs-codes/6804210030) Other millstones, grindstones, grinding wheels and the like, Of agglomerated synthetic or natural diamond, Articles consisting of multiple segments of diamond agglomerated with metal, attached to circular plates of steel, without cutting parts (whether or not attached to non-steel plates). Duty (MFN): free
- [6804.21.00.90](https://border.bot/countries/united-states/hs-codes/6804210090) Other millstones, grindstones, grinding wheels and the like, Of agglomerated synthetic or natural diamond, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 6804.21 yet.

- [The Harmonized System text for 6804.21](https://border.bot/hs-codes/680421)

- Previous subheading: [6804.10](https://border.bot/countries/united-states/hs-codes/680410) Millstones, grindstones, grinding wheels and the like, without frameworks, for grinding, sharpening, polishing, trueing or cutting, hand sharpening or polishing stones, and parts thereof, of natural stone, of agglomerated natural or artificial abrasives, or of ceramics, with or without parts of other materials
- Next subheading: [6804.22](https://border.bot/countries/united-states/hs-codes/680422) Of other agglomerated abrasives or of ceramics

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 6804.21?

The United States tariff splits HS 6804.21 (other millstones, grindstones, grinding wheels and the like: Of agglomerated synthetic or natural diamond) into 4 national lines: 6804.21.00.10 (segments for circular sawblades, consisting of diamond agglomerated with metal), 6804.21.00.20 (articles consisting of a continuous rim segment of diamond agglomerated with metal, attached to circular plates of steel (whether or not attached to non-steel plates)), 6804.21.00.30 (articles consisting of multiple segments of diamond agglomerated with metal, attached to circular plates of steel, without cutting parts (whether or not attached to non-steel plates)) and 6804.21.00.90 (other).

### What is the duty on HS 6804.21 in the United States?

Every United States line under 6804.21 is free of general (MFN) duty.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 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.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/680421.json