# United States tariff lines under HS 7306.21

> The United States tariff splits HS 7306.21 (casing and tubing of a kind used in drilling for oil or gas: Welded, of stainless steel) into 4 national lines: 7306.21.30.00 (threaded or coupled), 7306.21.40.00 (other), 7306.21.80.10 (imported with coupling) and 7306.21.80.50 (other). Every United States line under 7306.21 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/730621
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) / [7306.21](https://border.bot/countries/united-states/hs-codes/730621)

## Key facts

- HS subheading: [7306.21](https://border.bot/hs-codes/730621)
- Duty (MFN): Free
- National lines: 4
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 73: Articles of iron or steel

## United States lines under 7306.21

The United States tariff splits HS 7306.21 (casing and tubing of a kind used in drilling for oil or gas: Welded, of stainless steel) into 4 national lines: 7306.21.30.00 (threaded or coupled), 7306.21.40.00 (other), 7306.21.80.10 (imported with coupling) and 7306.21.80.50 (other).

Every United States line under 7306.21 is free of general (MFN) duty.

- [7306.21.30.00](https://border.bot/countries/united-states/hs-codes/7306213000) Casing and tubing of a kind used in drilling for oil or gas, Welded of stainless steel, Casing, Threaded or coupled. Duty (MFN): free
- [7306.21.40.00](https://border.bot/countries/united-states/hs-codes/7306214000) Casing and tubing of a kind used in drilling for oil or gas, Welded of stainless steel, Casing, Other. Duty (MFN): free
- [7306.21.80.10](https://border.bot/countries/united-states/hs-codes/7306218010) Casing and tubing of a kind used in drilling for oil or gas, Welded of stainless steel, Tubing, Imported with coupling. Duty (MFN): free
- [7306.21.80.50](https://border.bot/countries/united-states/hs-codes/7306218050) Casing and tubing of a kind used in drilling for oil or gas, Welded of stainless steel, Tubing, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 7306.21 yet.

- [The Harmonized System text for 7306.21](https://border.bot/hs-codes/730621)

- Previous subheading: [7306.19](https://border.bot/countries/united-states/hs-codes/730619) Other
- Next subheading: [7306.29](https://border.bot/countries/united-states/hs-codes/730629) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 7306.21?

The United States tariff splits HS 7306.21 (casing and tubing of a kind used in drilling for oil or gas: Welded, of stainless steel) into 4 national lines: 7306.21.30.00 (threaded or coupled), 7306.21.40.00 (other), 7306.21.80.10 (imported with coupling) and 7306.21.80.50 (other).

### What is the duty on HS 7306.21 in the United States?

Every United States line under 7306.21 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/730621.json