Loading...
HSChapter 84
U.S. exports of marine diesel & semi-diesel compression-ignition piston engines (HS 840810) totaled $19.2M in July 2026.
Importers of Marine Diesel & Semi-Diesel Compression-Ignition Piston Engines paid $1.7M in duties in July 2026 — an effective duty rate of 12% on $13.9M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataDiesel and semi-diesel engines for marine propulsion are classified under heading 840810, with seven 10-digit lines spanning a wide power range from below 111.9 kW (8408100005) through above 746 kW (8408100050) — a structure that reflects the enormous diversity of commercial marine applications from small workboats to large commercial vessels. Germany and Japan lead US imports under this heading, consistent with their dominant positions in commercial and recreational marine diesel manufacturing. High-power marine diesels above 373 kW are typically capital goods for commercial shipping or offshore applications, where lead times, warranty terms, and classification of spare parts are recurring compliance considerations.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
331 shipments/mo
CBP requires classification based on the manufacturer's rated continuous output in kilowatts as stated in the technical specification sheet. When output is near a boundary (e.g., close to 149.2 kW or 373 kW), importers should use the certified rated power from the type-approval documentation rather than nominal or peak figures. Obtaining a binding ruling from CBP is advisable for high-value engines where the correct line is genuinely uncertain.
Yes. Marine diesel engines above certain power thresholds are subject to EPA Tier standards for marine compression-ignition engines under the Clean Air Act. Importers must verify that the engine model holds a valid EPA certificate of conformity for the applicable tier before entry; non-certified engines may be detained or refused admission. This requirement applies independently of CBP tariff classification.
Supplier Network
Get discovered by U.S. importers searching for HS 840810 — Marine Diesel & Semi-Diesel Compression-Ignition Piston Engines. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8408100050 | Comp-Ignition Piston Engines,for Marine,Exc 746 Kw | $9.8M | 12.50% | 100.00% | $1.2M |
| 8408100030 | Comp-Igni Pst Eng,Marine,Exc223.8kw,not Exc 373 Kw | $2.2M | 9.30% | 74.51% | $204K |
| 8408100020 | Comp-Igni Pst Eng,Marine,Exc149.2kw,not Exc223.8kw | $1.7M | 5.56% | 77.13% | $95K |
| 8408100005 | Comp-Ignition Piston Eng, Marine Prop,N/Exc111.9kw | $1.6M | 6.21% | 53.84% | $100K |
| 8408100040 | Comp-Igni Pst Eng,Marine,Exc 373 Kw,not Exc 746 Kw | $259K | 8.36% | 83.58% | $22K |
| 8408100015 | Comp-Igni Pst Eng,Marine,Exc111.9kw N/Exc 149.2 Kw | $88K | 12.50% | 100.00% | $11K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
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.
ImportsExports
Imports
$15.6MYoY · Pro
Exports
$19.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Exports · July 2026
destination
customs district
origin
entry
rate provision · imports
9.8% enters free of duty; the effective duty rate is 10.57%.