U.S. exports of Insulating Fittings of Ceramics for Electrical Machines (HS 854710) totaled $10.7M in August 2026.
Importers of Insulating Fittings of Ceramics for Electrical Machines paid $1.7M in duties in August 2026, an average duty rate of 24.42% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataCeramic insulating fittings for electrical machines and appliances — including spark plug bodies and other precision ceramic components — serve critical dielectric and thermal functions in automotive ignition systems, industrial equipment, and high-frequency apparatus. The US schedule distinguishes fittings for spark-producing machines (8547104000), which captures automotive and small-engine ignition applications, from all other ceramic insulating fittings (8547108000). China is the leading import source, with Germany and Japan also prominent — the latter two reflecting OEM-grade ceramic precision manufacturing for automotive and industrial clients. Imports from China are subject to Section 301 tariffs.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
691 import shipments a month
A ceramic insulator body imported as a standalone component for use in spark plug assembly would typically fall under 8547104000, which covers insulating fittings for machines that produce sparks. If the complete assembled spark plug is imported instead, it would be classified under a different heading (8511) as an ignition part. The distinction between a component fitting and a finished part is critical and should be confirmed with a licensed customs broker.
Heading 854620 covers standalone electrical insulators — products whose primary function is to insulate conductors on power lines or in switchgear. Heading 854710 covers fittings that are integral parts of electrical machines or appliances, providing insulation within the machine's structure. The functional context (infrastructure insulation versus machine component) and the product's design for a specific machine application are the key distinguishing factors.
Subheading 3 of 3 in heading 8547
Subheading 854710 · $10.7M of $48.0M
ImportsExports
Imports
$6.8MYoY · free account
Exports
$10.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $80.0M of Insulating Fittings of Ceramics for Electrical Machines and exported $136.8M.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
South Korea and Mexico together take 61% of it.
customs district
origin
entry
rate provision · imports
6.9% enters free of duty; duty collected equals 24.42% of imports for consumption.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8547108000 | Ceramicinsulating Fittings for Machines, NESOI | $6.4M | 24.88% | 92.65% | $1.6M |
| 8547104000 | Insulating Fittings for Machines Producng Spark Pg | $397K | 16.92% | 100.00% | $67K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8547100000 | Insulating Fittings of Ceramics for Electrical Mch | $10.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
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