# United States tariff lines under HS 7307.91

> The United States tariff splits HS 7307.91 (other: Flanges) into 6 national lines: 7307.91.10.00 (of iron or nonalloy steel), 7307.91.30.00 (of alloy steel (except stainless steel)), 7307.91.50.10 (of iron or nonalloy steel), 7307.91.50.30 (of alloy steel (except stainless steel)) and 2 others. The general (MFN) duty differs by line: 3.3% on 7307.91.10.00, 3.2% on 7307.91.30.00, 5.5% on 7307.91.50.10, 5.5% on 7307.91.50.30, 5.5% on 7307.91.50.50 and 5.5% on 7307.91.50.70.

Source: https://border.bot/countries/united-states/hs-codes/730791
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 73](https://border.bot/countries/united-states/hs-codes/73) / [7307.91](https://border.bot/countries/united-states/hs-codes/730791)

## Key facts

- HS subheading: [7307.91](https://border.bot/hs-codes/730791)
- National lines: 6
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 73: Articles of iron or steel

## United States lines under 7307.91

The United States tariff splits HS 7307.91 (other: Flanges) into 6 national lines: 7307.91.10.00 (of iron or nonalloy steel), 7307.91.30.00 (of alloy steel (except stainless steel)), 7307.91.50.10 (of iron or nonalloy steel), 7307.91.50.30 (of alloy steel (except stainless steel)) and 2 others.

The general (MFN) duty differs by line: 3.3% on 7307.91.10.00, 3.2% on 7307.91.30.00, 5.5% on 7307.91.50.10, 5.5% on 7307.91.50.30, 5.5% on 7307.91.50.50 and 5.5% on 7307.91.50.70.

- [7307.91.10.00](https://border.bot/countries/united-states/hs-codes/7307911000) Other, Flanges, Not machined, not tooled and not otherwise processed after forging, Of iron or nonalloy steel. Duty (MFN): 3.3%
- [7307.91.30.00](https://border.bot/countries/united-states/hs-codes/7307913000) Other, Flanges, Not machined, not tooled and not otherwise processed after forging, Of alloy steel (except stainless steel). Duty (MFN): 3.2%
- [7307.91.50.10](https://border.bot/countries/united-states/hs-codes/7307915010) Other, Flanges, Other, With an inside diameter of less than 360 mm, Of iron or nonalloy steel. Duty (MFN): 5.5%
- [7307.91.50.30](https://border.bot/countries/united-states/hs-codes/7307915030) Other, Flanges, Other, With an inside diameter of less than 360 mm, Of alloy steel (except stainless steel). Duty (MFN): 5.5%
- [7307.91.50.50](https://border.bot/countries/united-states/hs-codes/7307915050) Other, Flanges, Other, With an inside diameter of 360 mm or more, Of iron or nonalloy steel. Duty (MFN): 5.5%
- [7307.91.50.70](https://border.bot/countries/united-states/hs-codes/7307915070) Other, Flanges, Other, With an inside diameter of 360 mm or more, Of alloy steel (except stainless steel). Duty (MFN): 5.5%

## In other countries

No other national tariff on border.bot has live lines under 7307.91 yet.

- [The Harmonized System text for 7307.91](https://border.bot/hs-codes/730791)

- Previous subheading: [7307.29](https://border.bot/countries/united-states/hs-codes/730729) Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel
- Next subheading: [7307.92](https://border.bot/countries/united-states/hs-codes/730792) Threaded elbows, bends and sleeves

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 7307.91?

The United States tariff splits HS 7307.91 (other: Flanges) into 6 national lines: 7307.91.10.00 (of iron or nonalloy steel), 7307.91.30.00 (of alloy steel (except stainless steel)), 7307.91.50.10 (of iron or nonalloy steel), 7307.91.50.30 (of alloy steel (except stainless steel)) and 2 others.

### What is the duty on HS 7307.91 in the United States?

The general (MFN) duty differs by line: 3.3% on 7307.91.10.00, 3.2% on 7307.91.30.00, 5.5% on 7307.91.50.10, 5.5% on 7307.91.50.30, 5.5% on 7307.91.50.50 and 5.5% on 7307.91.50.70.

## 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/730791.json