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HTS 8431.39.00.50: Of oil and gas field machinery

Chapter 84, Nuclear reactors, boilers, machinery and mechanical appliances. Subheading 8431.39: Other. Tariff line 8431.39.00: Other. The general (column 1) duty is Free. On a $10,000.00 ocean shipment priced on Oct 27, 2026, total duty runs from 15% (Mexico) to 40% (China) across the 15 largest US import origins once Chapter 99 measures are added.

General rate
Free
From China
40%
Lowest of 15
15% MX
Unit of quantity
No.

Effective duty by country of origin

Example: $10,000.00 shipment ($10,000.00 customs value, ocean, entered Oct 27, 2026, no preference claimed). Open a row for every layer applied and every layer considered and not applied, with the source behind each; layers with the same outcome for most origins are listed once below the table. Customs fees (MPF, HMF) are not duty and are in the calculator below.

OriginDuty rateOn $10,000.00Additional layers
China CN40%$4,000.00S232 15%, S301 25%
Considered, not applied

Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 4 more layers considered, not applied. Same as most origins, listed below.

Mexico MX15%$1,500.00S232 15%
    Considered, not applied

    Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

    Canada CA15%$1,500.00S232 15%
      Considered, not applied

      Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 4 more layers considered, not applied. Same as most origins, listed below.

      Vietnam VN15%$1,500.00S232 15%
        Considered, not applied

        Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

        India IN15%$1,500.00S232 15%
          Considered, not applied

          Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

          Germany DE15%$1,500.00S232 15%
            Considered, not applied

            Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

            Japan JP15%$1,500.00S232 15%
              Considered, not applied

              Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

              South Korea KR15%$1,500.00S232 15%
                Considered, not applied

                Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                Taiwan TW15%$1,500.00S232 15%
                  Considered, not applied

                  Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                  Thailand TH15%$1,500.00S232 15%
                    Considered, not applied

                    Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                    United Kingdom GB15%$1,500.00S232 15%
                      Considered, not applied

                      Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                      Italy IT15%$1,500.00S232 15%
                        Considered, not applied

                        Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                        Malaysia MY15%$1,500.00S232 15%
                          Considered, not applied

                          Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                          Indonesia ID15%$1,500.00S232 15%
                            Considered, not applied

                            Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                            Brazil BR15%$1,500.00S232 15%
                              Considered, not applied

                              Column 1 duty (MFN) 0%, Section 232 (national security) 15% applied; 5 more layers considered, not applied. Same as most origins, listed below.

                              Layers with the same outcome for most origins

                              Each layer below was applied or considered for the origins named under it, with the same result and reason for each.

                              Estimate duty for your shipment

                              Same engine as the LandedFees calculator. The link updates as you calculate, so you can share the exact estimate.

                              Other lines in heading 8431

                              CBP rulings for 8431.39.00

                              Search all CROSS rulings for 8431.39

                              Chapter 84 duty by trade lane

                              Questions about HTS 8431.39.00.50

                              What is the US import duty rate for HTS 8431.39.00.50?

                              The general (column 1) rate is Free. With Chapter 99 duties added, the effective duty on a $10,000 ocean shipment ranges from 15% (Mexico) to 40% (China) across the 15 origins priced here on Oct 27, 2026.

                              Does Section 301 apply to HTS 8431.39.00.50 from China?

                              Yes. Product of China listed under heading 9903.88.01 (List 1, U.S. note 20(b), 25%). The highest rate in effect is charged: 25%.

                              Is HTS 8431.39.00.50 subject to the Section 301 forced-labor duty?

                              No. Section 232 article (steel, aluminum and copper, heading 9903.82.10) is exempt under heading 9903.05.90 (U.S. note 52(f)). Heading 9903.05.31 (12.5% for China) is therefore not charged.

                              Is HTS 8431.39.00.50 covered by Section 232?

                              Yes. steel, aluminum and copper: derivative articles, note 16(c)(ix)-(x), column 1 under 15%. 15% on the full customs value under heading 9903.82.10.

                              Price a full shipment with HTS 8431.39.00.50

                              Several lines, freight and insurance, Incoterms, FTA claims and a PDF you can send to your broker.

                              Open the landed cost calculator

                              Sources and method

                              Each origin is priced by the same rate resolver and engine as the LandedFees calculator, from the USITC HTS 2026 Rev. 21 and the HTSUS Chapter 99 notes, on Oct 27, 2026. AD/CVD uses the all-others cash deposit rate. Estimates for planning, not a binding ruling or legal advice; confirm with your customs broker before filing.