# United States tariff line 8518.40.10.00: For use as repeaters in line telephony

> In the United States tariff, line 8518.40.10.00 covers audio-frequency electric amplifiers, for use as repeaters in line telephony. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 8518.40 in heading 85.18 (chapter 85).

Source: https://border.bot/countries/united-states/hs-codes/8518401000
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) / [8518.40](https://border.bot/countries/united-states/hs-codes/851840) / [8518.40.10.00](https://border.bot/countries/united-states/hs-codes/8518401000)

## Key facts

- Tariff line: 8518.40.10.00
- Covers: Audio-frequency electric amplifiers, for use as repeaters in line telephony
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [8518.40](https://border.bot/hs-codes/851840)

## What this line covers

In the United States tariff, line 8518.40.10.00 covers audio-frequency electric amplifiers, for use as repeaters in line telephony.

Its legal text is “For use as repeaters in line telephony”, read under “Audio-frequency electric amplifiers”.

## How it is structured

It falls under HS subheading 8518.40 in heading 85.18 (chapter 85). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- 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
- Heading 85.18: Microphones and stands therefor; loudspeakers, whether or not mounted in their enclosures; headphones and earphones, whether or not combined with a microphone, and sets consisting of a microphone and one or more loudspeakers; audio-frequency electric amplifiers; electric sound amplifier sets; parts thereof
- Subheading 8518.40: Audio-frequency electric amplifiers
- Line 8518.40.10.00: For use as repeaters in line telephony

## Duty

Goods under this line enter free of general (MFN) duty.

## In other countries

No other national tariff on border.bot has live lines under 8518.40 yet.

- [The Harmonized System text for 8518.40](https://border.bot/hs-codes/851840)

## Other lines under 8518.40

- [8518.40.20.00](https://border.bot/countries/united-states/hs-codes/8518402000) Other

- Previous line: [8518.30.20.00](https://border.bot/countries/united-states/hs-codes/8518302000) Other
- Next line: [8518.40.20.00](https://border.bot/countries/united-states/hs-codes/8518402000) Other

## Frequently asked questions

### What does tariff line 8518.40.10.00 cover in the United States tariff?

In the United States tariff, line 8518.40.10.00 covers audio-frequency electric amplifiers, for use as repeaters in line telephony.

### What is the general (MFN) duty on 8518.40.10.00 in the United States?

Goods under this line enter 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/8518401000.json