Chapter 84 is a broad category in the HS classification system covering 'nuclear reactors, boilers, machinery and mechanical appliances and parts thereof,' with an extremely wide scope ranging from steam boilers and internal combustion engines to various pumps, fans, machine tools, computers, etc. Its core characteristic is that the goods are devices or equipment that perform work through mechanical motion, rather than mere materials or chemical products. Within the chapter, it is further divided into multiple headings by power type, functional use, etc., making it one of the most important chapters for classifying mechanical and electrical products in international trade. Heading 8408 specifically covers 'compression-ignition internal combustion piston engines (diesel or semi-diesel engines),' commonly known as diesel engines. This heading includes compression-ignition engines used for various purposes such as vehicles, ships, generator sets, construction machinery, etc., regardless of power output, number of cylinders, or specific application. However, this heading does not include gasoline engines (classified under 8407) or engines exclusively for aviation (classified under 8411). Code 840820 has 6 digits: the first 2 digits '84' represent Chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances and parts thereof); digits 3-4 '08' represent heading 8408 (compression-ignition internal combustion piston engines); digits 5-6 '20' represent subheading 840820, i.e., 'compression-ignition internal combustion piston engines for vehicles.' Therefore, this code specifically refers to diesel engines used for road vehicles such as automobiles, trucks, and buses, excluding diesel engines for ships, power generation, or other non-vehicle purposes. This product is a diesel engine and is explicitly for automobiles, so it is classified under 840820. If it were a gasoline engine, it would be classified under 8407; if it were a marine diesel engine, it would be classified under 840810; if it were a diesel engine for generator sets, it might be classified under 8502. Classification must closely adhere to the two key conditions of 'compression-ignition' and 'for vehicles' to avoid confusion with adjacent subheadings.
Chapter
Chapter 84 is a broad category in the HS classification system covering 'nuclear reactors, boilers, machinery and mechanical appliances and parts thereof,' with an extremely wide scope ranging from steam boilers and internal combustion engines to various pumps, fans, machine tools, computers, etc. Its core characteristic is that the goods are devices or equipment that perform work through mechanical motion, rather than mere materials or chemical products. Within the chapter, it is further divided into multiple headings by power type, functional use, etc., making it one of the most important chapters for classifying mechanical and electrical products in international trade.
Heading
Heading 8408 specifically covers 'compression-ignition internal combustion piston engines (diesel or semi-diesel engines),' commonly known as diesel engines. This heading includes compression-ignition engines used for various purposes such as vehicles, ships, generator sets, construction machinery, etc., regardless of power output, number of cylinders, or specific application. However, this heading does not include gasoline engines (classified under 8407) or engines exclusively for aviation (classified under 8411).
Digit Breakdown
Code 840820 has 6 digits: the first 2 digits '84' represent Chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances and parts thereof); digits 3-4 '08' represent heading 8408 (compression-ignition internal combustion piston engines); digits 5-6 '20' represent subheading 840820, i.e., 'compression-ignition internal combustion piston engines for vehicles.' Therefore, this code specifically refers to diesel engines used for road vehicles such as automobiles, trucks, and buses, excluding diesel engines for ships, power generation, or other non-vehicle purposes.
Classification Basis
This product is a diesel engine and is explicitly for automobiles, so it is classified under 840820. If it were a gasoline engine, it would be classified under 8407; if it were a marine diesel engine, it would be classified under 840810; if it were a diesel engine for generator sets, it might be classified under 8502. Classification must closely adhere to the two key conditions of 'compression-ignition' and 'for vehicles' to avoid confusion with adjacent subheadings.
📝 Declaration Elements
Brand: Fill in the brand name of the engine, such as Cummins, Weichai, Yuchai, etc., which must match the physical nameplate. Model: Fill in the specific model of the engine, such as ISF2.8, WP10, etc., used to distinguish different specifications. Displacement: Fill in the total cylinder working volume of the engine, typically in milliliters (cc) or liters (L). Power: Fill in the rated power of the engine, typically in kilowatts (kW) or horsepower (hp). Fuel Type: Specify diesel to distinguish from gasoline or other fuels. Applicable Vehicle Type: Specify the type of vehicle it is used for, such as heavy trucks, light buses, etc. Year of Manufacture: Fill in the manufacturing year of the engine, which affects customs valuation and regulatory conditions. Is It Brand New: Declare whether the engine is brand new or second-hand (used); second-hand engines have special regulatory requirements. Brand: Weichai; Model: WP10.350; Displacement: 9726cc; Power: 257kW; Fuel Type: Diesel; Applicable Vehicle Type: Heavy truck; Year of Manufacture: 2022; Is It Brand New: Brand new. Mistakenly filling in the vehicle brand as the engine brand, causing the brand to mismatch the actual product. Incorrect displacement units, such as writing liters as milliliters, causing order-of-magnitude deviations. Failing to distinguish between brand new and second-hand; second-hand engines require relevant certificates and may involve import prohibitions.
Brand
Fill in the brand name of the engine, such as Cummins, Weichai, Yuchai, etc., which must match the physical nameplate.
⚠️ Mistakenly filling in the vehicle brand (such as Dongfeng, Jiefang) instead of the engine's own brand.
Model
Fill in the specific model of the engine, such as ISF2.8, WP10, etc., used to distinguish different specifications.
⚠️ Incomplete model entry or mismatch with the nameplate, leading to classification disputes.
Displacement
Fill in the total cylinder working volume of the engine, typically in milliliters (cc) or liters (L).
⚠️ Mistakenly filling in vehicle displacement or omitting units, causing data errors.
Power
Fill in the rated power of the engine, typically in kilowatts (kW) or horsepower (hp).
⚠️ Confusing maximum power with rated power, or failing to specify units.
Fuel Type
Specify diesel to distinguish from gasoline or other fuels.
⚠️ Vaguely filling in 'fuel oil' or 'internal combustion engine' without specifying diesel.
Applicable Vehicle Type
Specify the type of vehicle it is used for, such as heavy trucks, light buses, etc.
⚠️ Filling in 'for automobiles' which is too broad, without specifying the vehicle model.
Year of Manufacture
Fill in the manufacturing year of the engine, which affects customs valuation and regulatory conditions.
⚠️ Mistakenly filling in the vehicle year or omitting this item.
Is It Brand New
Declare whether the engine is brand new or second-hand (used); second-hand engines have special regulatory requirements.
⚠️ Failing to truthfully declare used items, leading to violations.
Example： Brand: Weichai; Model: WP10.350; Displacement: 9726cc; Power: 257kW; Fuel Type: Diesel; Applicable Vehicle Type: Heavy truck; Year of Manufacture: 2022; Is It Brand New: Brand new.
Common Mistakes：
Mistakenly filling in the vehicle brand as the engine brand, causing the brand to mismatch the actual product.
Incorrect displacement units, such as writing liters as milliliters, causing order-of-magnitude deviations.
Failing to distinguish between brand new and second-hand; second-hand engines require relevant certificates and may involve import prohibitions.
🎯 Classification Logic
The core basis for classification is the engine's ignition method (compression-ignition), use (for vehicles), and structural characteristics. According to General Rules of Interpretation 1 and 6, subheading 840820 explicitly refers to compression-ignition internal combustion piston engines for vehicles. Note that if the engine is a semi-diesel engine (hot-bulb type), it is also classified under this subheading; but if it is a gasoline engine, it is classified under 8407; if for ships, under 840810; if for generator sets, under 8502. 840810 Compression-ignition internal combustion piston engines for marine propulsion: Different use: 840810 is exclusively for marine propulsion, while 840820 is for road vehicles. 840890 Other compression-ignition internal combustion piston engines: 840890 covers diesel engines for non-vehicle, non-marine uses, such as construction machinery, power generation, etc. 840734 Reciprocating piston gasoline engines for vehicles: Different ignition method: 840734 is a gasoline engine, 840820 is a diesel engine. 850211 Compression-ignition internal combustion engine generator sets (≤75kVA): 840820 is a standalone engine, 850211 is a generator set consisting of an engine and a generator. 870120 Road tractors for semi-trailers: 840820 is an engine part, 870120 is a complete vehicle, different classification levels. Confirm the engine is compression-ignition (diesel) rather than spark-ignition (gasoline). Confirm the use is for vehicles, not for ships, power generation, or other purposes. Verify that displacement, power, and other parameters are consistent with the declaration. Check whether auxiliary equipment such as generators is included; if so, it may be classified under 8502. Confirm brand new or second-hand status; second-hand engines have special regulations.
Basis
The core basis for classification is the engine's ignition method (compression-ignition), use (for vehicles), and structural characteristics. According to General Rules of Interpretation 1 and 6, subheading 840820 explicitly refers to compression-ignition internal combustion piston engines for vehicles. Note that if the engine is a semi-diesel engine (hot-bulb type), it is also classified under this subheading; but if it is a gasoline engine, it is classified under 8407; if for ships, under 840810; if for generator sets, under 8502.
Confused Codes：
840810 - Compression-ignition internal combustion piston engines for marine propulsion
Different use: 840810 is exclusively for marine propulsion, while 840820 is for road vehicles.
840890 - Other compression-ignition internal combustion piston engines
840890 covers diesel engines for non-vehicle, non-marine uses, such as construction machinery, power generation, etc.
840734 - Reciprocating piston gasoline engines for vehicles
Different ignition method: 840734 is a gasoline engine, 840820 is a diesel engine.
840820 is a standalone engine, 850211 is a generator set consisting of an engine and a generator.
870120 - Road tractors for semi-trailers
840820 is an engine part, 870120 is a complete vehicle, different classification levels.
Self-Check：
✓ Confirm the engine is compression-ignition (diesel) rather than spark-ignition (gasoline).
✓ Confirm the use is for vehicles, not for ships, power generation, or other purposes.
✓ Verify that displacement, power, and other parameters are consistent with the declaration.
✓ Check whether auxiliary equipment such as generators is included; if so, it may be classified under 8502.
✓ Confirm brand new or second-hand status; second-hand engines have special regulations.
❓ FAQ
How are diesel engines and gasoline engines distinguished in HS codes? Diesel engines are compression-ignition and classified under 8408; gasoline engines are spark-ignition and classified under 8407. If used for vehicles, diesel engines are classified under 840820, and gasoline engines under 840734. The key distinction is the ignition method, which can be confirmed through the engine nameplate or technical documentation. How do the codes differ between diesel engines for automobiles and diesel engines for ships? Diesel engines for automobiles are classified under 840820, and those for ships under 840810. The main difference is the use; marine engines typically have higher power, different cooling methods, and are installed on ships. Proof of use must be provided during declaration. Can second-hand diesel engines be imported? What additional procedures are required? Import of second-hand diesel engines is strictly controlled, and some used mechanical and electrical products are prohibited from import. Procedures such as registration for import of used mechanical and electrical products and pre-shipment inspection are required, and they must comply with environmental protection, energy consumption, and other standards. It is recommended to consult customs or a professional customs broker in advance. Among the declaration elements for diesel engines, which is more important, power or displacement? Both are key elements; power affects classification and valuation, and displacement affects emission standards and classification. They must be truthfully declared to avoid rejection or inspection due to data discrepancies. If a diesel engine is intended for a generator set but is imported separately, which code should it be classified under? A separately imported diesel engine for power generation should be classified under 840890 (other compression-ignition internal combustion piston engines), not 840820. If imported together with a generator to form a generator set, it is classified under 8502. How can I check the import tax rate and regulatory conditions for diesel engines? You can check the latest tax rates, regulatory conditions, and inspection and quarantine requirements by entering HS code 840820 on the General Administration of Customs website, China International Trade Single Window, or professional tariff query tools. Tax rates may change, so it is recommended to refer to the latest official announcements. When classifying a diesel engine, is it considered whether it has a turbocharger? A turbocharger does not affect the HS code classification of the engine; it is still classified under 8408 as a compression-ignition internal combustion piston engine. However, if the turbocharger is imported separately, it is classified under 8414. How do cross-border e-commerce sellers determine the HS code for diesel engines? Cross-border e-commerce sellers need to determine the code based on the engine's actual use and ignition method. If it is a diesel engine for vehicles, classify under 840820; if it is a general-purpose diesel engine, classify under 840890. It is recommended to consult a professional customs broker or use the customs classification advance ruling service.
Q: How are diesel engines and gasoline engines distinguished in HS codes?
A: Diesel engines are compression-ignition and classified under 8408; gasoline engines are spark-ignition and classified under 8407. If used for vehicles, diesel engines are classified under 840820, and gasoline engines under 840734. The key distinction is the ignition method, which can be confirmed through the engine nameplate or technical documentation.
Q: How do the codes differ between diesel engines for automobiles and diesel engines for ships?
A: Diesel engines for automobiles are classified under 840820, and those for ships under 840810. The main difference is the use; marine engines typically have higher power, different cooling methods, and are installed on ships. Proof of use must be provided during declaration.
Q: Can second-hand diesel engines be imported? What additional procedures are required?
A: Import of second-hand diesel engines is strictly controlled, and some used mechanical and electrical products are prohibited from import. Procedures such as registration for import of used mechanical and electrical products and pre-shipment inspection are required, and they must comply with environmental protection, energy consumption, and other standards. It is recommended to consult customs or a professional customs broker in advance.
Q: Among the declaration elements for diesel engines, which is more important, power or displacement?
A: Both are key elements; power affects classification and valuation, and displacement affects emission standards and classification. They must be truthfully declared to avoid rejection or inspection due to data discrepancies.
Q: If a diesel engine is intended for a generator set but is imported separately, which code should it be classified under?
A: A separately imported diesel engine for power generation should be classified under 840890 (other compression-ignition internal combustion piston engines), not 840820. If imported together with a generator to form a generator set, it is classified under 8502.
Q: How can I check the import tax rate and regulatory conditions for diesel engines?
A: You can check the latest tax rates, regulatory conditions, and inspection and quarantine requirements by entering HS code 840820 on the General Administration of Customs website, China International Trade Single Window, or professional tariff query tools. Tax rates may change, so it is recommended to refer to the latest official announcements.
Q: When classifying a diesel engine, is it considered whether it has a turbocharger?
A: A turbocharger does not affect the HS code classification of the engine; it is still classified under 8408 as a compression-ignition internal combustion piston engine. However, if the turbocharger is imported separately, it is classified under 8414.
Q: How do cross-border e-commerce sellers determine the HS code for diesel engines?
A: Cross-border e-commerce sellers need to determine the code based on the engine's actual use and ignition method. If it is a diesel engine for vehicles, classify under 840820; if it is a general-purpose diesel engine, classify under 840890. It is recommended to consult a professional customs broker or use the customs classification advance ruling service.
⚠️ Disclaimer: HS code classification, declaration elements, tariff rates and regulatory conditions on this page are for reference only and do not constitute legal advice on customs classification. Tariff rates and regulations are subject to change; the latest announcements from the General Administration of Customs and on-site determinations shall prevail. Please consult professional customs brokers or customs authorities before import/export.