# United States tariff lines under HS 2921.51

> The United States tariff splits HS 2921.51 (aromatic polyamines and their derivatives; salts thereof: o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof) into 4 national lines: 2921.51.10.00 (4-Amino-2-(N,N-diethylamino) toluene hydrochloride;m-Phenylenediamine;o-Phenylenediamine; Toluene-2,4-diamine; Toluene-2,5-diamine; and Toluene-2,5-diamine sulfate), 2921.51.20.00 (photographic chemicals), 2921.51.30.00 (products described in additional U.S. note 3 to section VI) and 2921.51.50.00 (other). The general (MFN) duty is 6.5% on all 4 lines.

Source: https://border.bot/countries/united-states/hs-codes/292151
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2921.51](https://border.bot/countries/united-states/hs-codes/292151)

## Key facts

- HS subheading: [2921.51](https://border.bot/hs-codes/292151)
- Duty (MFN): 6.5%
- National lines: 4
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2921.51

The United States tariff splits HS 2921.51 (aromatic polyamines and their derivatives; salts thereof: o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof) into 4 national lines: 2921.51.10.00 (4-Amino-2-(N,N-diethylamino) toluene hydrochloride;m-Phenylenediamine;o-Phenylenediamine; Toluene-2,4-diamine; Toluene-2,5-diamine; and Toluene-2,5-diamine sulfate), 2921.51.20.00 (photographic chemicals), 2921.51.30.00 (products described in additional U.S. note 3 to section VI) and 2921.51.50.00 (other).

The general (MFN) duty is 6.5% on all 4 lines.

- [2921.51.10.00](https://border.bot/countries/united-states/hs-codes/2921511000) Aromatic polyamines and their derivatives; salts thereof, o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof, 4-Amino-2-(N,N-diethylamino) toluene hydrochloride;m-Phenylenediamine;o-Phenylenediamine; Toluene-2,4-diamine; Toluene-2,5-diamine; and Toluene-2,5-diamine sulfate. Duty (MFN): 6.5%
- [2921.51.20.00](https://border.bot/countries/united-states/hs-codes/2921512000) Aromatic polyamines and their derivatives; salts thereof, o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof, Other, Photographic chemicals. Duty (MFN): 6.5%
- [2921.51.30.00](https://border.bot/countries/united-states/hs-codes/2921513000) Aromatic polyamines and their derivatives; salts thereof, o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof, Other, Other, Products described in additional U.S. note 3 to section VI. Duty (MFN): 6.5%
- [2921.51.50.00](https://border.bot/countries/united-states/hs-codes/2921515000) Aromatic polyamines and their derivatives; salts thereof, o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof, Other, Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 2921.51 yet.

- [The Harmonized System text for 2921.51](https://border.bot/hs-codes/292151)

- Previous subheading: [2921.49](https://border.bot/countries/united-states/hs-codes/292149) Other
- Next subheading: [2921.59](https://border.bot/countries/united-states/hs-codes/292159) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2921.51?

The United States tariff splits HS 2921.51 (aromatic polyamines and their derivatives; salts thereof: o-, m-, p-Phenylenediamine, diaminotoluenes, and their derivatives; salts thereof) into 4 national lines: 2921.51.10.00 (4-Amino-2-(N,N-diethylamino) toluene hydrochloride;m-Phenylenediamine;o-Phenylenediamine; Toluene-2,4-diamine; Toluene-2,5-diamine; and Toluene-2,5-diamine sulfate), 2921.51.20.00 (photographic chemicals), 2921.51.30.00 (products described in additional U.S. note 3 to section VI) and 2921.51.50.00 (other).

### What is the duty on HS 2921.51 in the United States?

The general (MFN) duty is 6.5% on all 4 lines.

## 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/292151.json