# United States tariff lines under HS 8448.39

> The United States tariff splits HS 8448.39 (parts and accessories of machines of heading 8445 or of their auxiliary machinery: Other) into 3 national lines: 8448.39.10.00 (parts of spinning, doubling or twisting machines), 8448.39.50.00 (parts of winding or reeling machines) and 8448.39.90.00 (other). The general (MFN) duty differs by line: free on 8448.39.10.00, 3.7% on 8448.39.50.00 and free on 8448.39.90.00.

Source: https://border.bot/countries/united-states/hs-codes/844839
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8448.39](https://border.bot/countries/united-states/hs-codes/844839)

## Key facts

- HS subheading: [8448.39](https://border.bot/hs-codes/844839)
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8448.39

The United States tariff splits HS 8448.39 (parts and accessories of machines of heading 8445 or of their auxiliary machinery: Other) into 3 national lines: 8448.39.10.00 (parts of spinning, doubling or twisting machines), 8448.39.50.00 (parts of winding or reeling machines) and 8448.39.90.00 (other).

The general (MFN) duty differs by line: free on 8448.39.10.00, 3.7% on 8448.39.50.00 and free on 8448.39.90.00.

- [8448.39.10.00](https://border.bot/countries/united-states/hs-codes/8448391000) Parts and accessories of machines of heading 8445 or of their auxiliary machinery, Other, Parts of spinning, doubling or twisting machines. Duty (MFN): free
- [8448.39.50.00](https://border.bot/countries/united-states/hs-codes/8448395000) Parts and accessories of machines of heading 8445 or of their auxiliary machinery, Other, Parts of winding or reeling machines. Duty (MFN): 3.7%
- [8448.39.90.00](https://border.bot/countries/united-states/hs-codes/8448399000) Parts and accessories of machines of heading 8445 or of their auxiliary machinery, Other, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 8448.39 yet.

- [The Harmonized System text for 8448.39](https://border.bot/hs-codes/844839)

- Previous subheading: [8448.33](https://border.bot/countries/united-states/hs-codes/844833) Auxiliary machinery for use with machines of heading 8444, 8445, 8446 or 8447 (for example, dobbies, Jacquards, automatic stop motions and shuttle changing mechanisms); parts and accessories suitable for use solely or principally with the machines of this heading or of heading 8444, 8445, 8446 or 8447 (for example, spindles and spindle flyers, card clothing, combs, extruding nipples, shuttles, healds and heald-frames, hosiery needles)
- Next subheading: [8448.42](https://border.bot/countries/united-states/hs-codes/844842) Auxiliary machinery for use with machines of heading 8444, 8445, 8446 or 8447 (for example, dobbies, Jacquards, automatic stop motions and shuttle changing mechanisms); parts and accessories suitable for use solely or principally with the machines of this heading or of heading 8444, 8445, 8446 or 8447 (for example, spindles and spindle flyers, card clothing, combs, extruding nipples, shuttles, healds and heald-frames, hosiery needles)

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8448.39?

The United States tariff splits HS 8448.39 (parts and accessories of machines of heading 8445 or of their auxiliary machinery: Other) into 3 national lines: 8448.39.10.00 (parts of spinning, doubling or twisting machines), 8448.39.50.00 (parts of winding or reeling machines) and 8448.39.90.00 (other).

### What is the duty on HS 8448.39 in the United States?

The general (MFN) duty differs by line: free on 8448.39.10.00, 3.7% on 8448.39.50.00 and free on 8448.39.90.00.

## 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/844839.json