HTS heading 8409 · Chapter 84
HTS 8409: Parts suitable for use solely or principally with the…
HTS heading 8409 covers parts suitable for use solely or principally with the engines of heading 8407 or 8408. It has 10 tariff lines with a duty rate; the general (MFN) rates are 2.5% (6 lines), Free (4 lines).
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| 8409.10.00 | For aircraft engines | Free | 35% | ||
| 8409.10.00.40 | For use in civil aircraft[kg] | Estimate → | |||
| 8409.10.00.80 | Other[kg] | Estimate → | |||
| Other: | |||||
| 8409.91 | Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): | ||||
| 8409.91.10 | Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery | Free | 10% | ||
| 8409.91.10.40 | For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704[kg] | Estimate → | |||
| 8409.91.10.60 | For marine propulsion engines[kg] | Estimate → | |||
| 8409.91.10.80 | Other[kg] | Estimate → | |||
| Other: | |||||
| To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704: | |||||
| 8409.91.30.00 | Aluminum cylinder heads[No., kg] | 2.5% | Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | Estimate → |
| 8409.91.50 | Other | 2.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8409.91.50.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.91.50.81 | Steel forgings[kg] | Estimate → | |||
| 8409.91.50.85 | Other[kg, No.] | Estimate → | |||
| 8409.91.92 | For marine propulsion engines | 2.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8409.91.92.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.91.92.90 | Other[kg] | Estimate → | |||
| 8409.91.99 | Other | 2.5% | Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8409.91.99.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.91.99.90 | Other[kg] | Estimate → | |||
| 8409.99 | Other: | ||||
| 8409.99.10 | Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery | Free | 10% | ||
| 8409.99.10.40 | For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704[kg] | Estimate → | |||
| 8409.99.10.60 | For marine propulsion engines[kg] | Estimate → | |||
| 8409.99.10.80 | Other[kg] | Estimate → | |||
| Other: | |||||
| 8409.99.91 | To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 | 2.5% | Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8409.99.91.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.99.91.90 | Other[kg, No.] | Estimate → | |||
| 8409.99.92 | For marine propulsion engines | 2.5% | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) | 35% | |
| 8409.99.92.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.99.92.90 | Other[kg] | Estimate → | |||
| 8409.99.99 | Other | Free | 35% | ||
| 8409.99.99.10 | Connecting rods[No., kg] | Estimate → | |||
| 8409.99.99.90 | Other[kg] | Estimate → |
31 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 8409.91.30.00 at the general rate of 2.5%, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (2.5%) | $250.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $297.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Special program codes in this heading
- A, A*, A+
- Generalized System of Preferences (GSP)
- AU
- U.S.–Australia FTA
- B
- Automotive Products Trade Act
- BH
- U.S.–Bahrain FTA
- CL
- U.S.–Chile FTA
- CO
- U.S.–Colombia Trade Promotion Agreement
- D
- African Growth and Opportunity Act (AGOA)
- E, E*
- Caribbean Basin Economic Recovery Act
- IL
- U.S.–Israel FTA
- JO
- U.S.–Jordan FTA
- KR
- U.S.–Korea FTA (KORUS)
- MA
- U.S.–Morocco FTA
- OM
- U.S.–Oman FTA
- P, P+
- CAFTA-DR
- PA
- U.S.–Panama Trade Promotion Agreement
- PE
- U.S.–Peru Trade Promotion Agreement
- S, S+
- USMCA (United States–Mexico–Canada Agreement)
- SG
- U.S.–Singapore FTA
A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.
Frequently asked questions
What is the duty rate for HTS 8409?
Heading 8409 has 10 rate lines. The general (MFN) duty rates are 2.5% (6 lines), Free (4 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 8409?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 8409?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.