Key facts
- HS subheading
- 8421.31
- Duty (MFN)
- 2.5%
- National lines
- 1
- Tariff
- United States
- Chapter
- 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof
Summary
The United States tariff splits HS 8421.31 (filtering or purifying machinery and apparatus for gases: Intake air filters for internal combustion engines) into 1 national line: 8421.31.00.00 (intake air filters for internal combustion engines). The general (MFN) duty is 2.5% on this line.
United States lines under 8421.31
The United States tariff splits HS 8421.31 (filtering or purifying machinery and apparatus for gases: Intake air filters for internal combustion engines) into 1 national line: 8421.31.00.00 (intake air filters for internal combustion engines).
The general (MFN) duty is 2.5% on this line.
- 8421.31.00.00Intake air filters for internal combustion enginesDuty: 2.5%
In other countries
No other national tariff on border.bot has live lines under 8421.31 yet.
Frequently asked questions
How many national tariff lines does the United States tariff have under HS 8421.31?
The United States tariff splits HS 8421.31 (filtering or purifying machinery and apparatus for gases: Intake air filters for internal combustion engines) into 1 national line: 8421.31.00.00 (intake air filters for internal combustion engines).
What is the duty on HS 8421.31 in the United States?
The general (MFN) duty is 2.5% on this line.
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: