HS code · 6-digit subheading
HS Code 8407.90 – Engines; rotary internal combustion piston engines, for other than aircraft or marine propulsion
HS code 8407.90 is the 6-digit subheading for engines, rotary internal combustion piston engines, for other than aircraft or marine propulsion. It is used for wankel automotive engines, rotary UAV engines, rotary generator engines, industrial rotary engines and experimental rotary engines.
What HS 8407.90 covers
This HS code covers spark-ignition rotary internal combustion piston engines, excluding those for aircraft or marine propulsion. This category primarily includes Wankel engines used in specialized automotive applications, as well as smaller rotary engines for industrial equipment, generators, or unmanned aerial vehicles (UAVs) that are not classified as aircraft propulsion. The international trade for these engines is niche compared to conventional reciprocating engines, driven by specific performance requirements like high power-to-weight ratio, compact size, and smooth operation. Exporters are often specialized manufacturers in countries with advanced engineering capabilities. Importers include manufacturers of specialized vehicles, industrial machinery, and defense contractors. Key trade considerations involve engine efficiency, durability, emissions, and the availability of parts and servicing, as rotary engines have unique design characteristics that require specialized expertise.
- Covers
- Wankel automotive engines
- Rotary UAV engines
- Rotary generator engines
- Industrial rotary engines
- Experimental rotary engines
- Compact rotary engines
- Range extender rotary engines
- Examples
Mazda 13B-MSP Renesis engine, UAV Engines Ltd. AR801 engine, LiquidPiston X-Engine, Freedom Motors FR-80 engine, Norton NRV588 engine
Codes often confused with 8407.90
Common mistake. This code is distinct due to its "rotary" engine type and the exclusion of aircraft (840710) and marine propulsion (84072x), and should not be confused with reciprocating engines (84073x).
Top exporters and importers of HS code 840790, 2025
In 2025, the largest exporter of HS code 840790 in UN Comtrade data was China, with 35% of world exports; the largest importer in UN Comtrade data was the United States, with 26% of world imports. Mexico reports $451M of its heading 8407 imports without product detail (confidential), so it may also belong among the top importers.
Top exporters 2025 · share of world exports
- 1 China $1.2B 35% of world exports
- 2 United States $460M 13% of world exports
- 3 Finland $267M 7.7% of world exports
World total: $3.5B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $872M 26% of world imports
- 2 Vietnam* ~$268M 8.1% of world imports · partner records ↗
- 3 China $213M 6.4% of world imports
Mexico reports $451M of its heading 8407 imports without product detail (confidential), so it may also belong among the top importers.
World total: $3.3B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for 8407.90
Brazil does not split HS 8407.90: its NCM code is 8407.90.00.
All Brazil NCM codes in heading 84.07 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8407.90
What is HS code 840790?
HS code 840790 is a 6-digit subheading in the Harmonized System that covers: Engines; rotary internal combustion piston engines, for other than aircraft or marine propulsion. This HS code covers spark-ignition rotary internal combustion piston engines, excluding those for aircraft or marine propulsion. This category primarily includes Wankel engines used in specialized automotive applications, as well as smaller rotary engines for industrial equipment, generators, or unmanned aerial vehicles (UAVs) that are not classified as aircraft propulsion. The international trade for these engines is niche compared to conventional reciprocating engines, driven by specific performance requirements like high power-to-weight ratio, compact size, and smooth operation. Exporters are often specialized manufacturers in countries with advanced engineering capabilities. Importers include manufacturers of specialized vehicles, industrial machinery, and defense contractors. Key trade considerations involve engine efficiency, durability, emissions, and the availability of parts and servicing, as rotary engines have unique design characteristics that require specialized expertise.
What products fall under HS code 840790?
Wankel automotive engines, Rotary UAV engines, Rotary generator engines, Industrial rotary engines, Experimental rotary engines, Compact rotary engines, Range extender rotary engines
What are common misclassifications for HS code 840790?
This code is distinct due to its "rotary" engine type and the exclusion of aircraft (840710) and marine propulsion (84072x), and should not be confused with reciprocating engines (84073x).
Which countries are the top exporters of goods under HS code 840790?
In 2025, the top exporters of HS code 840790 in UN Comtrade data were China ($1.2B, 35% of world exports), the United States ($460M) and Finland ($267M). World exports came to about $3.5B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 840790?
In 2025, the top importers of HS code 840790 in UN Comtrade data were the United States ($872M, 26% of world imports), Vietnam (about $268M) and China ($213M). World imports came to about $3.3B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Mexico reports $451M of its heading 8407 imports without product detail (confidential), so it may also belong among the top importers.
How is HS code 840790 structured?
HS code 840790 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (07) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 840790?
In Brazil, HS code 840790 is NCM 8407.90.00. The last two digits are 00 because Brazil does not split this HS code further.