Harmonized Tariff Schedule of the United States · HTS code · HS 8547.10

8547.10.40

8547.10.40: Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines

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. 8547 Insulating fittings for electrical machines, appliances or equipment, being fittings wholly of insulating material apart from any minor components of metal (for example, threaded sockets) incorporated during molding solely for the purposes of assembly, other than insulators of heading 8546; electrical conduit tubing and joints therefor, of base metal lined with insulating material:
  2. 8547.10 Insulating fittings of ceramics:
  3. 8547.10.40 Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines

What you pay

Importing into USA

Customs duty 3% standard rate depends on the country of origin
Additional duties and charges 1 additional measure
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.

Additional duties and charges 1

  • Additional dutySection 301 — China — technology transfer, IP and innovation (2018 actions and 2024 four-year review) 25%
    Applies to goods from
    China
    In force
    from 24 September 2018
    Legal act
    HTSUS 9903.88.03

Preferential rates by country

Agreement or schemeCountriesRate
General (MFN)—3%
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, Belarus60%

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

8547.10 Insulating fittings of ceramics

UK Free Third-country duty 1 tariff line EU 4.7% Third-country duty 1 tariff line Türkiye 4.7% Third-country duty 1 tariff line Canada Free General (MFN) 1 tariff line Mexico Free General (MFN) 4 tariff lines Brazil 16% General (MFN) 1 tariff line Argentina 16% General (MFN) 1 tariff line Peru Free General (MFN) 2 tariff lines New Zealand specific or compound duty General (MFN) 1 tariff line Japan Free General (MFN) 1 tariff line Taiwan 5% General (MFN) 1 tariff line GCC 5% General (MFN) 1 tariff line Switzerland Free General (MFN) 1 tariff line Norway Free General (MFN) 1 tariff line North Macedonia 4.7% General (MFN) 1 tariff line Nigeria 10% General (MFN) 1 tariff line

USA lines: 8547.10

Legal notes

Chapter notes: Chapter 85 →

In the Harmonized Tariff Schedule of the United States, 8547.10.40 is one of 2 lines under subheading 8547.10, insulating fittings of ceramics.

The general duty is 3%, and quantities are declared in p/st.

For the same subheading, the UK duty is free, the EU duty is 4.7%, the Türkiye duty is 4.7%, the Canada duty is free, the Mexico duty is free, the Brazil duty is 16%, the Argentina duty is 16%, the Peru duty is free, the Japan duty is free, the Taiwan duty is 5%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is 4.7% and the Nigeria duty is 10%.

The United States imported goods of subheading 8547.10 worth US$121m in 2024; the largest supplier was China, and the United Kingdom ranked 6th with US$2m.

Questions and answers

What is the USA import duty for HTS code 8547.10.40?

The general duty in the Harmonized Tariff Schedule of the United States is 3%; 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 8547.10.40 under US trade agreements?

Yes. The Special column reads “Free (A, AU, 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 8547.10 as a whole, the largest supplier in 2024 was China (US$62m), followed by Japan.

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