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HSChapter 84
U.S. imports of marine diesel & semi-diesel compression-ignition piston engines (HS 840810) totaled $16.3M in April 2026, traded with 16 countries.
Importers of Marine Diesel & Semi-Diesel Compression-Ignition Piston Engines paid $1.9M in duties in April 2026 — an effective duty rate of 12% on $15.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Marine Diesel & Semi-Diesel Compression-Ignition Piston Engines imports of $16.3M in April 2026 ran 13% below the year-to-date monthly average of $18.8M.
Last updated: April 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.
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.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8408100050 | COMP-IGNITION PISTON ENGINES,FOR MARINE,EXC 746 KW | $9.0M | 12.50% | $1.1M |
| 8408100030 | COMP-IGNI PST ENG,MARINE,EXC223.8KW,NOT EXC 373 KW | $3.5M | 12.50% | $381K |
| 8408100040 | COMP-IGNI PST ENG,MARINE,EXC 373 KW,NOT EXC 746 KW | $1.4M | 12.50% | $180K |
| 8408100020 | COMP-IGNI PST ENG,MARINE,EXC149.2KW,NOT EXC223.8KW | $1.2M | 12.50% | $76K |
| 8408100005 | COMP-IGNITION PISTON ENG, MARINE PROP,N/EXC111.9KW | $1.0M | 11.63% | $94K |
| 8408100015 | COMP-IGNI PST ENG,MARINE,EXC111.9KW N/EXC 149.2 KW | $96K | 8.57% | $7K |
COMP-IGNITION PISTON ENGINES,FOR MARINE,EXC 746 KW
COMP-IGNI PST ENG,MARINE,EXC223.8KW,NOT EXC 373 KW
COMP-IGNI PST ENG,MARINE,EXC 373 KW,NOT EXC 746 KW
COMP-IGNI PST ENG,MARINE,EXC149.2KW,NOT EXC223.8KW
COMP-IGNITION PISTON ENG, MARINE PROP,N/EXC111.9KW
COMP-IGNI PST ENG,MARINE,EXC111.9KW N/EXC 149.2 KW
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8408100050 | COMP-IGNITION PISTON ENGINES,FOR MARINE,EXC 746 KW | $24.5M |
| 8408100040 | COMP-IGNI PST ENG,MARINE,EXC 373 KW,NOT EXC 746 KW | $1.8M |
| 8408100030 | COMP-IGNI PST ENG,MARINE,EXC223.8KW,NOT EXC 373 KW | $577K |
| 8408100020 | COMP-IGNI PST ENG,MARINE,EXC149.2KW,NOT EXC223.8KW | $252K |
| 8408100010 | DIESEL ENGINES, NOT EXCEEDING 149.2 KW, MARINE | $248K |
COMP-IGNITION PISTON ENGINES,FOR MARINE,EXC 746 KW
176 no
COMP-IGNI PST ENG,MARINE,EXC 373 KW,NOT EXC 746 KW
27 no
COMP-IGNI PST ENG,MARINE,EXC223.8KW,NOT EXC 373 KW
21 no
COMP-IGNI PST ENG,MARINE,EXC149.2KW,NOT EXC223.8KW
21 no
DIESEL ENGINES, NOT EXCEEDING 149.2 KW, MARINE
15 no
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| State | Imports | Exports | Balance |
|---|---|---|---|
| Indiana | $112K | $21.3M | +$21.2M |
| Washington | $3.7M | $286K | -$3.5M |
| Florida | $3.0M | $313K | -$2.7M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| SAVANNAH, GA | $142K | $20.4M | +$20.2M |
| CHARLESTON, SC | $3.4M | $621K | -$2.8M |
| TACOMA, WA | $2.1M | $1.5M | -$628K |