Product classification
HS code for Diesel engine parts: 8409.99
Engines, parts for internal combustion piston engines (excluding spark-ignition).
Classification of diesel engine parts under HS 8409.99
HS code 8409.99 is the designated classification for parts suitable for use solely or principally with compression-ignition internal combustion piston engines. According to Note 2 to Section XVI of the Harmonized System, parts of machines are generally classified in their respective headings if they are not excluded by Section or Chapter notes. Heading 8409 is specifically provided for parts of engines falling under headings 8407 or 8408. Within this heading, a distinction is made between parts for spark-ignition engines (8409.91) and all other engines (8409.99). Since diesel engines operate on compression ignition, their components—such as fuel injectors, cylinder heads, pistons, and rings—are classified under 8409.99. This classification applies to parts that do not have a more specific heading elsewhere in the nomenclature (such as gaskets of 8484 or crankshafts of 8483) and are identifiable as being specifically for diesel engines. The classification remains 8409.99 regardless of whether the engine is used for a vehicle, a ship, or a stationary generator.
- Covers
- Pistons for diesel engines
- Cylinder heads for compression-ignition engines
- Fuel injectors and injection nozzles
- Cylinder liners for diesel blocks
- Inlet and exhaust valves for diesel engines
- Also under 8409.99
- Cummins engine parts
- Caterpillar diesel components
- Bosch common rail injectors
- Yanmar marine engine parts
Codes often confused with 8409.99
Common mistake. A common error is classifying diesel engine parts under 8409.91, which is strictly for spark-ignition (petrol) engines. Another frequent mistake is attempting to classify these parts under 8708, which covers general parts and accessories for motor vehicles. However, Note 2(e) to Section XVII explicitly excludes internal combustion piston engines and parts thereof from Chapter 87, directing them back to heading 8409.
Top exporters and importers of HS 840999 (the code used for diesel engine parts), 2025
In 2025, the largest exporter of HS 840999 (the code used for diesel engine parts) in UN Comtrade data was Germany, with 22% of world exports; the largest importer in UN Comtrade data was Germany, with 10% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 840999, not only diesel engine parts.
Top exporters 2025 · share of world exports
- 1 Germany $8.7B 22% of world exports
- 2 China $4.0B 10.0% of world exports
- 3 Netherlands $2.6B 6.5% of world exports
World total: $40.0B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $3.8B 10% of world imports
- 2 United States $3.8B 10% of world imports
- 3 United Kingdom $2.4B 6.3% of world imports
World total: $37.7B 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 that did not report are estimated from what other countries recorded trading with them. 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 codes for diesel engine parts
Brazil splits HS 8409.99 into 17 NCM codes. Pick the one that matches your product:
- 8409.99.12Diesel engine cylinder blocks and crankcases
- 8409.99.14Diesel engine intake or exhaust valves
- 8409.99.15Diesel engine intake or exhaust manifolds
- 8409.99.17Diesel engine valve guides
- 8409.99.21Diesel engine pistons, 200 mm diameter or more
- 8409.99.29Diesel engine pistons under 200 mm
- 8409.99.30Diesel engine cylinder liners
- 8409.99.41Diesel connecting rods, 30 kg or more
- 8409.99.49Diesel connecting rods under 30 kg
- 8409.99.51Diesel cylinder heads, 200 mm diameter or more
- 8409.99.59Diesel cylinder heads under 200 mm
- 8409.99.61Diesel injector nozzles, 20 mm diameter or more
- 8409.99.69Diesel injector nozzles under 20 mm
- 8409.99.71Diesel piston rings, 200 mm diameter or more
- 8409.99.79Diesel piston rings under 200 mm
- 8409.99.91Diesel liners welded to heads, dia. 200 mm or more
- 8409.99.99Other diesel engine parts
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about diesel engine parts
What is the HS code for Diesel engine parts?
The HS code for Diesel engine parts is 840999 (Engines; parts for internal combustion piston engines (excluding spark-ignition)). The HS code for parts of a diesel (compression-ignition) engine is 8409.99.
How do I classify Diesel engine parts for customs?
Diesel engine parts is classified under HS code 840999 — Engines; parts for internal combustion piston engines (excluding spark-ignition). This is a 6-digit subheading level code.
Are fuel pumps classified under this code?
No, fuel pumps are specifically classified under heading 8413, as they have their own specific heading in the HS nomenclature.
Which countries are the top exporters of diesel engine parts (HS 840999)?
In 2025, the top exporters of HS 840999 (the code used for diesel engine parts) in UN Comtrade data were Germany ($8.7B, 22% of world exports), China ($4.0B) and the Netherlands ($2.6B). World exports came to about $40.0B, 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 diesel engine parts (HS 840999)?
In 2025, the top importers of HS 840999 (the code used for diesel engine parts) in UN Comtrade data were Germany ($3.8B, 10% of world imports), the United States ($3.8B) and the United Kingdom ($2.4B). World imports came to about $37.7B, 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.
Is the HS code for Diesel engine parts the same in all countries?
The base HS code 840999 for Diesel engine parts is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for diesel engine parts in Brazil?
Brazil splits HS 840999 into 17 NCM codes, so the right one for diesel engine parts depends on the product's details: 8409.99.12 (Diesel engine cylinder blocks and crankcases), 8409.99.14 (Diesel engine intake or exhaust valves), 8409.99.15 (Diesel engine intake or exhaust manifolds), 8409.99.17 (Diesel engine valve guides), 8409.99.21 (Diesel engine pistons, 200 mm diameter or more), 8409.99.29 (Diesel engine pistons under 200 mm), and more.