Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus, precision instruments and apparatus; parts and accessories thereof. Goods of this chapter generally have high precision and high-tech characteristics, used for measurement, detection, analysis, control, etc. The chapter scope ranges from simple spectacle lenses to complex electronic measuring instruments, but excludes mechanical appliances of Section XVI or glass products of Chapter 70, etc. Heading 9024 includes machines and appliances for testing the mechanical properties of various materials (such as metals, wood, textiles, plastics, rubber, etc.), as well as instruments for testing hardness, strength, compressibility, elasticity, etc. These devices are generally used in industrial quality control, materials research, and other fields. This heading also covers vehicle-mounted testing equipment, but attention should be paid to whether it belongs to testing equipment for motor vehicles. Code 902490 is a six-digit subheading. The first 2 digits '90' represent Chapter 90 (optical, measuring, checking, etc. instruments). The 3rd-4th digits '24' represent heading 9024 (machines and appliances for testing the mechanical properties of various materials). The 5th-6th digits '90' represent subheading 902490, i.e., the 'other' subheading under heading 9024, generally referring to parts and accessories not elsewhere specified or included. Therefore, 902490 specifically refers to dedicated parts of vehicle-mounted testing machines (testing equipment under heading 9024). The goods are parts of vehicle-mounted testing machines. The vehicle-mounted testing machine itself is classified under heading 9024 (equipment for testing mechanical properties of materials). If its dedicated parts are not explicitly listed in other subheadings, they are classified under 902490 (other). They cannot be classified under 902480 (other machines and appliances) because parts are different from complete machines; nor can they be classified under parts of other headings, such as 8466 (parts of machine tools), because vehicle-mounted testing machines are not machine tools.

Product name: The specific name of the declared goods, which should accurately describe the function of the part, such as 'sensor for vehicle-mounted testing machine', 'fixture for vehicle-mounted testing machine', etc. Use: Explain that the part is dedicated to vehicle-mounted testing machines, and briefly describe the material or performance tested by the testing machine, such as 'used for vehicle-mounted testing machine to test the strength of metal materials'. Material: Declare the main material of the part, such as stainless steel, aluminum alloy, plastic, etc. Material affects classification; some material parts may be classified according to material. Brand: Fill in the brand of the part (if no brand, fill in 'none'). Brand helps confirm the identity of the goods but is not a determining factor for classification. Model: Fill in the model of the part, which should correspond to the model of the complete machine for customs verification. Working principle: Briefly describe the functional principle of the part in the testing machine, such as 'applies pressure through hydraulic pressure', 'collects displacement signals', etc. Whether dedicated part: Declare whether the part is dedicated to vehicle-mounted testing machines. Dedicated parts are classified under 902490; general-purpose parts may be classified according to material. Product name: Pressure sensor for vehicle-mounted testing machine; Use: Dedicated to vehicle-mounted testing machine, used to test compressive strength of materials; Material: Stainless steel; Brand: ABC; Model: PS-100; Working principle: Converts pressure signal into electrical signal through piezoelectric effect; Whether dedicated part: Yes. Declaring general-purpose parts (such as standard bolts, washers) as dedicated parts, which should be classified under corresponding material headings. Failure to provide the correspondence between the part and the complete machine, making it impossible to prove specificity. Incorrect material declaration, such as reporting aluminum alloy as stainless steel, affecting classification.

Core basis for classification: 1. Whether the part is dedicated to machines and equipment of heading 9024; 2. Whether it belongs to parts not elsewhere specified or included under other subheadings of heading 9024; 3. If the part is a general-purpose part, it is classified according to material (e.g., steel bolts are classified under 7318). According to the Explanatory Notes to the Harmonized System, parts that are mainly or solely for a particular machine, and not excluded, are classified under that machine's heading. 902480 Other machines and appliances for testing the mechanical properties of materials: 902480 is a complete machine, 902490 is a part. If a complete testing machine is declared, it should be classified under 902480; if a part is declared, it should be classified under 902490. 846693 Parts and accessories for machine tools: Vehicle-mounted testing machines are not machine tools, so their parts are not classified under 8466. If the part is dedicated to machine tools, it is classified under 8466. 903190 Parts of other measuring or checking instruments and apparatus: 9031 is other measuring instruments, 9024 is material testing equipment. If the part is dedicated to 9024 equipment, it is classified under 902490; if used for 9031 equipment, it is classified under 903190. 732690 Other articles of iron or steel: If the part is a general-purpose iron or steel article and cannot be proven to be dedicated to 9024 equipment, it is classified according to material under 7326. Is the part dedicated to vehicle-mounted testing machines? Is the part specifically named in other subheadings of 9024? Is the part a general-purpose part (such as a standard part)? Does the material affect classification? Is the complete machine classified under 9024?

Which HS code should parts of vehicle-mounted testing machines be classified under? Vehicle-mounted testing machines themselves are classified under heading 9024. Their dedicated parts, if not named in other subheadings, should be classified under 902490. However, note: if the parts are general-purpose parts (such as bolts, washers), they should be classified according to material, for example, steel bolts under 7318. How to determine whether a part is dedicated to vehicle-mounted testing machines? Specificity is usually determined by whether the design, model, and function of the part are only applicable to that testing machine. If the part can be used for other equipment, it may be considered a general-purpose part. When declaring, provide the complete machine model, part drawings, etc., to prove specificity. What is the difference between 902490 and 902480? 902480 is complete machines and appliances for testing the mechanical properties of materials, while 902490 is parts of these machines. Simply put, complete machines are classified under 902480, parts under 902490. However, if a part is named in other subheadings, it is classified under those other subheadings first. If the part of a vehicle-mounted testing machine is a sensor, should it be classified under 902490 or 903190? This depends on the use of the sensor. If the sensor is dedicated to a vehicle-mounted testing machine (equipment of 9024), it is classified under 902490; if the sensor is a general-purpose measuring sensor used for multiple devices, it may be classified under 903190. The key is whether it is dedicated. What declaration elements are required when declaring 902490? Usually, product name, use, material, brand, model, working principle, whether dedicated part, etc., are required. Specific requirements are subject to customs. It is recommended to refer to the 'Catalogue of Standard Declaration Elements for Import and Export Goods of the Customs of the People's Republic of China'. If parts of vehicle-mounted testing machines are general-purpose parts, where should they be classified? General-purpose parts should be classified according to material, for example, steel bolts under 7318, plastic parts under 3926, rubber parts under 4016, etc. They cannot be classified under 902490 just because they are used in testing machines. How to query the tax rate for 902490? Tax rates may change. It is recommended to query the latest tax rates through the official website of the General Administration of Customs, China International Trade Single Window, or professional tariff query tools. Note that different rules of origin may apply to different agreement rates. What are the consequences of incorrect classification of parts of vehicle-mounted testing machines? Incorrect classification may lead to customs inspection, supplementary taxes, fines, and even affect the enterprise's credit rating. It is recommended to consult a professional customs broker or customs classification expert before declaration to ensure accurate classification.