Harmonized Tariff Schedule of the United States · HTS code · HS 8538.90

8538.90.40

8538.90.40: Other, for the articles of subheading 8535.90.40, 8536.30.40 or 8536.50.40, of ceramic or metallic materials, electrically or mechanically reactive to changes in temperature

Other parts for switching and control apparatus

Not declarable on its own: use one of its 1 subdivisions Data: Harmonized Tariff Schedule of the United States · checked on 24 October 2026

  1. 8538 Parts suitable for use solely or principally with the apparatus of heading 8535, 8536 or 8537:
  2. 8538.90 Other:
  3. 8538.90.40 Other, for the articles of subheading 8535.90.40, 8536.30.40 or 8536.50.40, of ceramic or metallic materials, electrically or mechanically reactive to changes in temperature

What you pay

Importing into USA

Customs duty 3.5% standard rate depends on the country of origin
Additional duties and charges —
VAT no federal VAT; a Merchandise Processing Fee of 0.3464 % is charged on formal entries
Duty calculatorCalculate duty and taxes →

US additional duties of HTS chapter 99 in force on 22 October 2026 are included (Section 301, 232, 338 and 201). IEEPA duties are no longer collected after the Supreme Court ruling of February 2026. Conditional exemptions (US content, end use, metal share) are not computed: check the provision.

Additional duties and import rules

Charges on top of the customs duty, and rules the goods must meet at the border.

No additional measures recorded for this origin.

Preferential rates by country

Agreement or schemeCountriesRate
General (MFN)—3.5%
US–Australia FTA AUAustraliaFree
US–Bahrain FTA BHBahrainFree
US–Chile FTA CLChileFree
US–Colombia TPA COColombiaFree
US–Israel FTA ILIsraelFree
US–Jordan FTA JOJordanFree
US–Korea FTA KRSouth KoreaFree
US–Morocco FTA MAMoroccoFree
US–Oman FTA OMOmanFree
CAFTA-DR PCosta Rica, Dominican Republic, El Salvador, Guatemala, Honduras, NicaraguaFree
US–Panama TPA PAPanamaFree
US–Peru TPA PEPeruFree
USMCA SCanada, MexicoFree
US–Singapore FTA SGSingaporeFree
Column 2Cuba, North Korea, Russia, Belarus35%

Special: reduced rates under trade agreements and preference programmes; the letters in brackets name the programmes (for example AU = Australia FTA, KR = Korea FTA).

Same subheading in other tariffs

8538.90 Parts suitable for use solely or principally with: other

UK Free Third-country duty 10 tariff lines EU 1.7% – 3.2% Third-country duty 4 tariff lines · average 2.5% Türkiye 1.7% – 3.2% Third-country duty 4 tariff lines · average 2.5% Canada Free Third-country duty 8 tariff lines Mexico Free Third-country duty 5 tariff lines Brazil Free – 16% Third-country duty 3 tariff lines · average 8.9% Argentina Free – 16% Third-country duty 3 tariff lines · average 8.9% Peru Free Third-country duty 1 tariff line New Zealand Free – 5% Third-country duty 11 tariff lines · average 3.6% Japan Free Third-country duty 1 tariff line Taiwan 2% – 5% Third-country duty 3 tariff lines · average 3.3% GCC 5% Third-country duty 1 tariff line Switzerland Free Third-country duty 1 tariff line Norway Free Third-country duty 1 tariff line North Macedonia 1.7% – 3.2% Third-country duty 4 tariff lines · average 2.5% Nigeria 5% Third-country duty 1 tariff line

USA lines: 8538.90

Binding rulings for similar goods

Decisions of U.S. Customs and Border Protection (CROSS) and HMRC (Advance Tariff Rulings) on goods classified here. A ruling binds only its holder, but shows how the authorities classify similar goods. The descriptions are the authorities’ own, in English.

  • N344462 U.S. CBP 18 December 2024 · 8538.90.81.80

    The tariff classification of an electrical connector cap from China

  • N343024 U.S. CBP 23 October 2024 · 8538.90.81.60

    The tariff classification of conduit connector from China

  • N339672 U.S. CBP 29 April 2024 · 8538.90.60.00

    The tariff classification of from an electrical enclosure from China

  • N328441 U.S. CBP 21 October 2022 · 8538.90.30.00

    The tariff classification of Printed Circuit Board Assemblies (PCBAs) from China.

  • 600015005 HMRC 16 March 2026 – 15 March 2029 · 8538 90 99 99

    Printed Circuit Assembly for various models of robotic mowers. Robotic mower nose module assembly which serves as a multifunctional interface for the robotic mower. Its primary purposes include: • Connecting to radar for object detection and navigation. • Interface for external accessories,…

  • 600013696 HMRC 19 November 2025 – 18 November 2028 · 8538 90 99 99

    This component is a Human-Machine Interface (HMI) Console Assembly, designed to display the mower’s settings and operating modes, transmit user commands (e.g. start, stop, mode selection) to the mower’s internal systems. It works by the encoder and/or push-button allow the user to interact with…

  • 600013690 HMRC 18 November 2025 – 17 November 2028 · 8538 90 99 99

    This component is the main control board (PCBA) for a robotic lawn mower. It is responsible for controlling and coordinating all mower operations, including motor control, navigation, battery management, and safety systems and interfacing with sensors (e.g. collision, lift, tilt, magnetic) and…

  • 600013251 HMRC 24 October 2025 – 23 October 2028 · 8538 90 99 99

    A part of a control system of components which are intended for lawnmowers (not subject to the ATaR decision.) However the Part is only suitable for use solely or principally with the apparatus of heading(s) 8535, 8536 or 8537. The HMI board displays settings and operating modes, transmitting user…

36 rulings in total for this code

Legal notes

Chapter notes: Chapter 85 →

In the Harmonized Tariff Schedule of the United States, 8538.90.40 is one of 5 lines under subheading 8538.90, parts suitable for use solely or principally with: other.

The general duty is 3.5%, and quantities are declared in p/st.

For the same subheading, the UK duty is free, the EU duty is 1.7%–3.2%, the Türkiye duty is 1.7%–3.2%, the Canada duty is free, the Mexico duty is free, the Brazil duty is 0%–16%, the Argentina duty is 0%–16%, the Peru duty is free, the New Zealand duty is 0%–5%, the Japan duty is free, the Taiwan duty is 2%–5%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is 1.7%–3.2% and the Nigeria duty is 5%.

The United States imported goods of subheading 8538.90 worth US$4bn in 2024; the largest supplier was Mexico.

Questions and answers

What is the USA import duty for HTS code 8538.90.40?

The general duty in the Harmonized Tariff Schedule of the United States is 3.5%; the supplementary unit is p/st. Preferential rates for goods from agreement countries, anti-dumping duties and VAT are not included.

Is there a lower rate for 8538.90.40 under US trade agreements?

Yes. The Special column reads “Free (A*,AU,B, BH, CL, CO,D,E, IL, JO, KR, MA, OM,P, PA, PE,S, SG)”: the letters in brackets name the agreements and programmes that grant it.

Where does the United States import these goods from?

For subheading 8538.90 as a whole, the largest supplier in 2024 was Mexico (US$1bn), followed by China.

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Typical products

Everyday names, not part of the legal text.