# United States tariff lines under HS 8540.71

> The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other). The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.

Source: https://border.bot/countries/united-states/hs-codes/854071
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 85](https://border.bot/countries/united-states/hs-codes/85) / [8540.71](https://border.bot/countries/united-states/hs-codes/854071)

## Key facts

- HS subheading: [8540.71](https://border.bot/hs-codes/854071)
- National lines: 2
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 85: Electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles

## United States lines under 8540.71

The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other).

The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.

- [8540.71.20.00](https://border.bot/countries/united-states/hs-codes/8540712000) Microwave tubes (for example, magnetrons, klystrons, traveling wave tubes, carcinotrons), excluding grid-controlled tubes, Magnetrons, Modified for use as parts of microwave ovens. Duty (MFN): free
- [8540.71.40.00](https://border.bot/countries/united-states/hs-codes/8540714000) Microwave tubes (for example, magnetrons, klystrons, traveling wave tubes, carcinotrons), excluding grid-controlled tubes, Magnetrons, Other. Duty (MFN): 3.7%

## In other countries

No other national tariff on border.bot has live lines under 8540.71 yet.

- [The Harmonized System text for 8540.71](https://border.bot/hs-codes/854071)

- Previous subheading: [8540.60](https://border.bot/countries/united-states/hs-codes/854060) Thermionic, cold cathode or photocathode tubes (for example, vacuum or vapor or gas filled tubes, mercury arc rectifying tubes, cathode-ray tubes, television camera tubes); parts thereof
- Next subheading: [8540.79](https://border.bot/countries/united-states/hs-codes/854079) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8540.71?

The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other).

### What is the duty on HS 8540.71 in the United States?

The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.

## 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/854071.json