Harmonized System
U.S. imports of Diesel & Semi-Diesel Compression-Ignition Piston Engines (Other) (HS 840890) totaled $314.1M in August 2026, imported from 40 countries.
Importers of Diesel & Semi-Diesel Compression-Ignition Piston Engines (Other) paid $32.7M in duties in August 2026, an average duty rate of 10.41% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Diesel & Semi-Diesel Compression-Ignition Piston Engines (Other) imports of $314.1M in August 2026 ran 15% above the year-to-date monthly average of $272.5M.
Last updated: August 2026 dataPower output is the primary classification axis for these compression-ignition engines not elsewhere specified: the US schedule breaks them into agricultural/horticultural applications (8408901000, 8408901040, 8408901080) and general-purpose tiers ranging from under 149.2 kW up through engines exceeding 1,119 kW (8408909010 through 8408909050). Engines in the higher power bands are critical inputs for construction, mining, marine, and stationary power-generation equipment. The United Kingdom, Japan, and Germany are the leading US import sources, reflecting the concentration of heavy-duty diesel engineering among European and Japanese OEMs. Importers should confirm whether specific engine configurations are subject to EPA emissions certification requirements before entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
7.6K import shipments a month
The US tariff schedule subdivides heading 840890 by end-use (agricultural/horticultural vs. general) and then by rated output in kilowatts. General-purpose engines are tiered at thresholds of 149.2 kW, 373 kW, 746 kW, and 1,119 kW, so accurate nameplate power data is essential for correct classification.
Yes. Non-road and stationary diesel engines imported into the US must comply with EPA emissions standards under the Clean Air Act. Importers typically must demonstrate conformance with applicable Tier standards or obtain an exemption before the engines can be sold or placed into service.
Trade Directory
List your company under HS 840890 — Diesel & Semi-Diesel Compression-Ignition Piston Engines (Other), so the companies trading it can find you. Be the first supplier listed.
Subheading 1 of 3 in heading 8408
Subheading 840890 · $314.1M of $463.6M
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 |
|---|---|---|---|---|---|
| 8408909010 | Comp-Ign Int Comb Pst Eng, NESOI, Not Exc 149.2 Kw | $172.2M | 9.63% | 85.62% | $16.6M |
| 8408909050 | Comp-Ign Int Comb Pst Eng, NESOI, Exceeding 1,119 Kw | $78.5M | 13.59% | 96.06% | $10.7M |
| 8408909030 | Comp-Ign Int Comb Pst Eng, NESOI, Exc373kw N/E 746kw | $29.9M | 9.75% | 93.65% | $2.9M |
| 8408909020 | Comp-Ign Int Comb Pst Eng, NESOI, Ex149.2kw N/E373kw | $26.9M | 6.88% | 65.46% | $1.8M |
| 8408901080 | Comp-Ig Int Comb Pst Eng, In Agr, Hor Mac Gt 37.3kw | $3.2M | 10.02% | 92.54% | $318K |
| 8408909040 | Comp-Ign Int Comb Pst Eng, NESOI, Exc373kw N/E1119kw | $2.4M | 10.22% | 86.00% | $240K |
| 8408901040 | Comp-Ig Int Comb Pst Eng, In Agr, Hor Mac Gt=37.3kw | $846K | 12.39% | 100.00% | $105K |
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.
Imports · August 2026
origin
United Kingdom and Japan together supply 50% of it.
customs district
destination
entry
rate provision · imports
10.0% enters free of duty; duty collected equals 10.41% of imports for consumption.
ImportsExports
Imports
$314.1MYoY · free account
Exports
$172.4MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $3.1B of Diesel & Semi-Diesel Compression-Ignition Piston Engines (Other) and exported $2.0B.
Through August 2026. Source: U.S. Census Bureau.