U.S. imports of Spark Plugs for Internal Combustion Engines (HS 851110) totaled $52.7M in August 2026, imported from 40 countries.
Importers of Spark Plugs for Internal Combustion Engines paid $8.5M in duties in August 2026, an average duty rate of 17.28% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Spark Plugs for Internal Combustion Engines imports of $52.7M in August 2026 ran 12% above the year-to-date monthly average of $46.9M.
Last updated: August 2026 dataSpark plugs are a high-volume aftermarket and OEM input for gasoline-powered automotive, marine, and small-engine applications, all consolidating into a single 10-digit line (8511100000) under this heading. The aftermarket replacement segment drives significant import activity, with product differentiation based on electrode material (copper, iridium, platinum), heat range, and thread specification rather than tariff classification. Importers should be aware that spark plugs of Chinese origin may be subject to Section 301 tariffs, while those sourced from Mexico or Canada benefit from USMCA treatment if rules-of-origin requirements are met.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.9K import shipments a month
No. All spark plugs for internal combustion engines — whether for passenger vehicles, motorcycles, marine engines, or small outdoor power equipment — classify under the single line 8511100000. There is no HTS distinction based on engine size or application within this heading.
To claim USMCA preference on spark plugs from Canada or Mexico, the goods must satisfy the applicable rules of origin, typically a tariff classification change or regional value content threshold. Importers must retain a valid certification of origin and ensure the product's production history supports the claim; CBP may request supporting records during a post-entry audit.
Subheading 3 of 7 in heading 8511
Subheading 851110 · $52.7M of $378.8M
ImportsExports
Imports
$52.7MYoY · free account
Exports
$30.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $589.3M of Spark Plugs for Internal Combustion Engines and exported $367.9M.
Through August 2026. Source: U.S. Census Bureau.
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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 |
|---|---|---|---|---|---|
| 8511100000 | Spark Plugs for Internal Combustion Engines | $49.4M | 17.28% | 93.72% | $8.5M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8511100000 | Spark Plugs for Internal Combustion Engines | $30.4M |
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.
Imports · August 2026
origin
Japan and Germany together supply 76% of it. China pays 50.4% duty; Mexico 3.7%.
customs district
destination
entry
rate provision · imports
5.9% enters free of duty; duty collected equals 17.28% of imports for consumption.