Section XVI · Nuclear reactors, boilers, machinery and mechanical appliances; parts

8406.90

Parts:

How this code is built
84

Chapter

Nuclear reactors, boilers, machinery and mechanical appliances; parts

06

Heading

The product family within the chapter

90

Subheading

The specific good, identical worldwide

The first six digits are the same in every country that uses the Harmonized System. The United States adds two more for the tariff rate and, often, two more for statistics — which is why the rates below are listed against 8- and 10-digit numbers rather than against this code.

How the schedule reaches this code

  1. 84Nuclear reactors, boilers, machinery and mechanical appliances; parts
  2. 8406Steam turbines and other vapor turbines, and parts thereof:
  3. Parts:

Published US duty rates

Duty is set at the 8- or 10-digit line, not at this 6-digit subheading, so more than one rate can sit under this code.

  • 8406.90.20.00Rotors, finished for final assemblyNo.
    General
    5%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    20%

    Countries without normal trade relations.

  • 8406.90.30.00Rotors, not further advanced than cleaned or machined for removal of fins, gates, sprues, and risers, or to permit location in finishing machineryNo.
    General
    5%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    20%

    Countries without normal trade relations.

  • 8406.90.40.00Blades, rotating or stationaryNo.
    General
    5%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    20%

    Countries without normal trade relations.

  • 8406.90.45Other
    General
    5%
    Special (FTA)
    Free (A,AU,BH,CL,CO,D,E,IL,JO,JP,KR,MA,OM,P,PA,PE,S,SG)

    Only if the goods qualify under one of these programs.

    Column 2
    20%

    Countries without normal trade relations.

  • 8406.90.50.00Rotors, finished for final assemblyNo.
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    27.5%

    Countries without normal trade relations.

  • 8406.90.60.00Rotors, not further advanced than cleaned or machined for removal of fins, gates, sprues, and risers, or to permit location in finishing machineryNo.
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    27.5%

    Countries without normal trade relations.

  • 8406.90.70.00Blades, rotating or stationaryNo.
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    27.5%

    Countries without normal trade relations.

  • 8406.90.75.00Otherkg
    General
    Free
    Special (FTA)
    —

    No preferential rate published.

    Column 2
    27.5%

    Countries without normal trade relations.

Schedule footnotes

  • See 9903.88.03.
  • See 9903.90.08.

A reference to Chapter 99 means an additional action — a Section 232 or 301 measure, an exclusion, or a quota — applies on top of the rate above.

This is the listed rate. Antidumping and countervailing duty orders, Chapter 99 actions and preference qualification all change what is actually collected, and classification is a judgement about your goods. Verify with your licensed customs broker before you file.

Other subheadings in heading 8406

Source: U.S. International Trade Commission (USITC) — 2026 HTS Revision 12, released 2026-07-21, published at hts.usitc.gov. A U.S. Government work in the public domain.