Key facts
- HS code
- 8403.90
- Covers
- Parts
- Edition
- HS2022
- Duty in the United States
- See its 1 line
Summary
HS code 8403.90 covers parts. It sits in heading 84.03 (central heating boilers other than those of heading 84.02) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Other goods of heading 84.03 are classified under 8403.10 (boilers). National tariff lines under 8403.90 are live on border.bot for the United States (1 line, also used by 1 other country).
What this code covers
HS code 8403.90 covers parts.
The legal text of the subheading is “Parts”, in HS2022.
What it doesn’t cover
Other goods of heading 84.03 are classified under 8403.10 (boilers).
- 8403.10Boilers
How it is structured
8403.90 is a six-digit subheading. Its first two digits, 84, are the chapter; the first four, 8403, are heading 84.03; the last two, 90, identify the subheading within the heading.
Countries add their own digits after these six for their national tariff lines.
- Subheading 8403.90
- Parts
In other countries
National tariff lines under 8403.90 are live on border.bot for the United States (1 line, also used by 1 other country).
- United States1 line, used by 1 other country
Frequently asked questions
What does HS code 8403.90 cover?
HS code 8403.90 covers parts.
Which heading and chapter is HS code 8403.90 in?
HS code 8403.90 is in heading 84.03 (central heating boilers other than those of heading 84.02) in chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof).
Where are goods of heading 84.03 classified when 8403.90 doesn’t fit?
Other goods of heading 84.03 are classified under 8403.10 (boilers).
Which countries’ tariffs list national lines under HS code 8403.90?
National tariff lines under 8403.90 are live on border.bot for the United States (1 line, also used by 1 other country).
Sources and updates
The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.
This page was last updated on 11 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.