HTS 8409.99.10Parts suitable for use solely or principally with the engines of heading 8407 or 8408:Other: Other: 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

What that translates to:Cast-iron parts for diesel engines, only cleaned or trimmed

Also written 84099910. Rates as CBP is collecting them today. Updated Oct 1, 2026.

Country of origin

Cast-iron parts for diesel engines, only cleaned or trimmed (HTS 8409.99.10) from China, as of Oct 1, 2026: the tariffs below apply to different 10-digit statistical lines of this code, so the total depends on which line your goods are entered under; each layer names its lines.

Total duty rateDepends on the 10-digit line

Auto and auto-parts tariffSection 232, since May 3, 2025Applies only to line 8409.99.104025%

Forced-labor tariffSection 301, since Jul 24, 2026Doesn't apply to line 8409.99.104012.5%

China tariffSection 301, since May 10, 201925%

Regular dutyBase rate (MFN) in the tariff scheduleFree

Total dutyDepends on the 10-digit line

The auto and auto-parts tariff doesn't apply to “all entries of articles classifiable under provisions of the HTSUS enumerated in subdivision (g) of this note or meeting the requirements of subdivision (p) of this note … (ii) that are not parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans, and cargo vans) and light trucks” (HTS 9903.94.06).

No forced-labor tariff on line 8409.99.1040: the auto and auto-parts tariff (HTS 9903.94.05) or the truck and bus tariff (HTS 9903.74.08) covers it instead, whichever applies.

Depending on the goods, the auto and auto-parts tariff (HTS 9903.94.05) or the truck and bus tariff (HTS 9903.74.08) applies, never both; the stack shows the auto and auto-parts tariff.

Court status: Challenged at the U.S. Court of International Trade in In re Section 301 Forced Labor Cases, Court No. 26-03555-3JP, before a three-judge panel. The plaintiffs, Learning Resources and others, have moved for judgment on the agency record, arguing that the action (91 FR 47318) exceeds USTR's statutory authority, is arbitrary and capricious, and is pretextual; 25 states, plaintiffs in Court No. 26-cv-03467-3JP, support them as amici (brief filed Sep 11, 2026). No ruling as of Oct 1, 2026, so the rate is unchanged.

Sources: USITC Harmonized Tariff Schedule, Revision 20 (2026); Commerce (International Trade Administration), Implementing Certain Tariff-Related Elements of the United States-Japan Agreement, 90 FR 44638, Sep 16, 2025; HTS 9903.94.05; USTR, Notice of Actions in Section 301 Investigations (forced labor), 91 FR 47318, Jul 28, 2026; HTS 9903.05.31; USTR, Notice of Modification of Section 301 Action (List 3 raised to 25% from May 10, 2019), 84 FR 20459, May 9, 2019; HTS 9903.88.03.

Estimate your duty

Special rules apply to this code or country, so we don't estimate it here. A licensed customs broker can work it out for your shipment.

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Official description

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: Other: Other: 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

Legal text from the Harmonized Tariff Schedule, Revision 20 (2026), chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof.

Statistical lines

The 10-digit numbers used on entry paperwork. They share this code's duty rates.

8409.99.1040 (8409991040)For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 · reported in kg
8409.99.1060 (8409991060)For marine propulsion engines · reported in kg
8409.99.1080 (8409991080)Other · reported in kg

What changed for this code

Jul 24, 2026Forced-labor tariffs start on imports from 60 economies (Section 301)
Jul 22, 202625% Section 301 tariff on products of Brazil starts
May 1, 2026Taiwan's auto parts and some wood products get a 15% Section 232 rate
Jan 1, 2026Section 301 tariff on Nicaragua starts at 0%, set to rise to 10% in 2027 and 15% in 2028

Questions about HTS 8409.99.10

What is the duty rate for HTS 8409.99.10?

The regular (column 1 general) rate printed in the tariff schedule is Free. Additional tariffs depend on the country of origin; choose one above to see its full rate.

Is HTS 8409.99.10 subject to Section 301 tariffs?

Yes, for goods from 85 countries and territories as of Oct 1, 2026, including Algeria, Angola, Argentina, Australia, Austria. Choose a country above to see the rate and any exemptions.

Is HTS 8409.99.10 subject to Section 232 tariffs?

Yes, for goods from 207 countries and territories as of Oct 1, 2026, including Afghanistan, Åland Islands, Albania, Algeria, Andorra. Choose a country above to see the rate and any exemptions.

HTSLookup shows the duties CBP collects on this code by country of origin. Antidumping or countervailing duties may also apply to some exporters; they're set per company and aren't shown.