Loading...
HSChapter 84
U.S. imports of parts for spark-ignition internal combustion piston engines (non-aircraft) (HS 840991) totaled $645.4M in April 2026, traded with 64 countries.
Importers of Parts for Spark-Ignition Internal Combustion Piston Engines (Non-Aircraft) paid $56.5M in duties in April 2026 — an effective duty rate of 15% on $383.3M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataMexico dominates US imports under this heading, reflecting deeply integrated North American automotive supply chains where engine components — cylinder heads, connecting rods, steel forgings, and cast-iron parts — move across borders as part of just-in-time manufacturing. The schedule distinguishes parts by material (cast iron at 8409911040–8409911080, aluminum cylinder heads at 8409913000, steel forgings at 8409915081) and by end-use sector: road vehicles, marine propulsion, and residual applications each carry separate 10-digit lines. Japan and China are also significant suppliers, making this heading a focal point for Section 301 tariff exposure on Chinese-origin parts.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Classification depends on the part's principal design use, not its potential interchangeability. If the part is specifically designed and marketed for road vehicle engines, it falls under lines such as 8409911040; if designed for marine propulsion, 8409911060 applies. When dual-use is genuinely ambiguous, a binding ruling request to CBP is the most reliable path to certainty.
Yes. Many parts classified under heading 840991 that originate in China are subject to Section 301 tariffs. The applicable list and rate tier depend on the specific 10-digit HTS code, so importers should verify current Section 301 exposure for each line before finalizing sourcing decisions.
Supplier Network
Get discovered by U.S. importers searching for HS 840991 — Parts for Spark-Ignition Internal Combustion Piston Engines (Non-Aircraft). Be the first supplier listed.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $249.5M | $108.7M | -$140.8M |
| JAPAN | $144.4M | $3.8M | -$140.6M |
| CANADA | $49.6M | $93.7M | +$44.1M |
| CHINA | $57.4M | $3.2M | -$54.2M |
| KOREA, SOUTH | $39.3M | $383K | -$38.9M |
Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8409915085 | PARTS FOR SP-IG PST ENG FOR RD TR,BUS,AUTO,TRUCKS | $428.8M | 13.11% | $34.4M |
| 8409913000 | ALUMINUM CYLINDER HEADS,SPARK-IGN PIST ENG.FOR VEH | $104.1M | 10.16% | $3.1M |
| 8409919990 | PARTS, EXC CONN RODS, FOR SP-IG PST ENGINES, NESOI | $57.7M | 27.01% | $13.2M |
| 8409919290 | PARTS FOR SP-IG PST ENG FOR MARINE PROPULSION | $15.8M | 15.22% | $1.6M |
| 8409915010 | CONN RODS FOR SP-IG PST ENG FOR RD TR,BUS,AUTO,TRK | $15.5M | 9.18% | $1.2M |
| 8409911080 | CAST-IRON PTS FOR SPARK-IGNITION PST ENGINES,NESOI | $10.5M | 12.99% | $1.0M |
| 8409911040 | CAST-IRON PTS F SP-IG PST ENG F RD TR,BUS,AUTO,TRK | $7.8M | 21.16% | $1.4M |
| 8409919910 | CONN RODS FOR SPARK IGNITION PISTON ENGINES, NESOI | $2.4M | 23.43% | $375K |
| 8409911060 | CAST-IRON PTS FOR SP-IG PST ENG FOR MARINE PROPULS | $1.6M | 16.95% | $90K |
| 8409919210 | CONN RODS FOR SP-IG PST ENG FOR MARINE PROPULSION | $758K | 10.77% | $54K |
| 8409915081 | STL FORG FOR SPK-IGN PIST ENG TRACT/BUS/AUTO/TRUCK | $537K | 9.78% | $48K |
PARTS FOR SP-IG PST ENG FOR RD TR,BUS,AUTO,TRUCKS
ALUMINUM CYLINDER HEADS,SPARK-IGN PIST ENG.FOR VEH
PARTS, EXC CONN RODS, FOR SP-IG PST ENGINES, NESOI
PARTS FOR SP-IG PST ENG FOR MARINE PROPULSION
CONN RODS FOR SP-IG PST ENG FOR RD TR,BUS,AUTO,TRK
CAST-IRON PTS FOR SPARK-IGNITION PST ENGINES,NESOI
CAST-IRON PTS F SP-IG PST ENG F RD TR,BUS,AUTO,TRK
CONN RODS FOR SPARK IGNITION PISTON ENGINES, NESOI
CAST-IRON PTS FOR SP-IG PST ENG FOR MARINE PROPULS
CONN RODS FOR SP-IG PST ENG FOR MARINE PROPULSION
STL FORG FOR SPK-IGN PIST ENG TRACT/BUS/AUTO/TRUCK
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8409914000 | PARTS F SPARK IGN ENG F RD TR, BUS, AUTO OR TRUCKS | $171.2M |
| 8409918000 | PARTS FOR SPARK-IG PISTON ENG, NESOI | $73.6M |
| 8409916000 | PARTS F SPARK IG ENG FOR MARINE PROPULSION | $6.5M |
PARTS F SPARK IGN ENG F RD TR, BUS, AUTO OR TRUCKS
8.9M kg
PARTS FOR SPARK-IG PISTON ENG, NESOI
2.9M kg
PARTS F SPARK IG ENG FOR MARINE PROPULSION
229.0K kg
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | $215.7M | $92.9M | -$122.8M |
| DETROIT, MI | $57.4M | $77.1M | +$19.6M |
| LOS ANGELES, CA | $84.4M | $4.3M | -$80.1M |