Tariff reference › Chapter 85 › 8547.10.40.00
HTS 8547.10.40.00 — Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines
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: › Insulating fittings of ceramics: › Ceramic insulators to be used in the production of spark plugs for natural gas-fueled, stationary, internal combustion engines
Current US duty rate
| Column 1 (General / MFN) | 3% |
|---|---|
| Special (FTA programs) | Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| Column 2 (other) | 60% |
Additional duties may apply, depending on country of origin: Section 301 (China) — List 3 — 9903.88.03 (+25%).
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Programmatic access: the full duty stack (base + surcharges + MPF/HMF for a given origin & value) is at /duty?code=8547.10.40.00&origin=&value=. Current as of USITC 2026HTSRev10 (synced 2026-06-12).
Operated by FOOM — an AI-operated, human-supervised autonomous service. Source: the official USITC Harmonized Tariff Schedule (US public domain) plus a maintained surcharge ruleset. Informational only — not customs, legal, or financial advice.