Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus, precision instruments and apparatus, and parts and accessories thereof. This chapter has a broad scope, ranging from spectacles and microscopes to medical imaging equipment. The core characteristic is that these goods are generally high-tech, used for measurement, testing, medical or industrial purposes, and often require precision manufacturing. The chapter notes exclude instruments for certain specific uses (such as measuring tools for machines), and classification requires a comprehensive assessment based on both function and use. Heading 9022 covers instruments and apparatus based on the use of X-rays or of alpha, beta, gamma or other ionizing radiation, whether or not for medical, surgical, dental or veterinary uses, including X-ray tubes, high tension generators, control panels, screens, examination tables, chairs and other specialized parts and accessories. This heading covers both complete machines (such as CT scanners and X-ray machines) and their specialized parts. However, it should be noted that general-purpose electronic components (such as resistors and capacitors) are not classified under this heading. Code 902290 is a six-digit subheading. The first two digits '90' represent Chapter 90 (optical, medical and other instruments). Digits 3-4 '22' represent heading 9022 (ionizing radiation equipment and parts). Digits 5-6 '90' represent subheading 902290, i.e., 'other' parts and accessories. Under 9022, there are typically subheadings such as 9022.1 (X-ray for medical use), 9022.2 (other X-ray equipment), 9022.3 (alpha, beta, gamma ray equipment), while 902290 is a residual subheading for specialized parts not otherwise specified. Therefore, 902290 specifically refers to specialized parts for vehicle-mounted radiation equipment (such as vehicle-mounted X-ray machines and vehicle-mounted CT scanners), but does not include general-purpose parts. Parts for vehicle-mounted radiation equipment are classified under 902290 because they are specialized parts for equipment under heading 9022 and are not specifically named in other subheadings. For example, specialized components such as collimators and detectors for vehicle-mounted X-ray machines, if imported separately, should be classified under 902290. General-purpose parts (such as screws and cables) should be classified according to their material. In addition, if a part itself constitutes a complete X-ray tube, it should be classified under 902230 (X-ray tubes), not 902290. Therefore, 902290 is the residual subheading for specialized parts.

Product Name: The specific name of the declared commodity, which should accurately reflect the function of the part, such as 'collimator for vehicle-mounted X-ray machine' or 'detector module for vehicle-mounted CT scanner', avoiding vague descriptions like 'part'. Use: Explain what equipment the part is used for, such as 'for vehicle-mounted X-ray radiography system' or 'for vehicle-mounted CT scanner', and indicate the equipment model or series. Material: The main constituent materials, such as 'aluminum alloy', 'plastic', 'stainless steel', etc. For composite materials, the main material may be indicated. Brand: The manufacturer or brand name, such as 'Siemens', 'GE', 'Philips', etc. If there is no brand, fill in 'none'. Model: The model or part number of the part, used for unique identification, such as 'PN-12345'. Working Principle: Briefly explain the functional principle of the part in the equipment, such as 'used to generate X-rays' or 'used to detect radiation intensity'. Whether Specialized Part: Declare whether the part is exclusively for equipment under heading 9022 and cannot be used for other equipment. Product Name: Collimator for vehicle-mounted X-ray machine; Use: For vehicle-mounted X-ray radiography system, model MobileArt Evolution; Material: Aluminum alloy + lead; Brand: Canon; Model: CL-2024; Working Principle: Limits the X-ray beam range by adjusting lead blades; Whether Specialized Part: Yes, exclusively for vehicle-mounted X-ray machine, cannot be used for other equipment. Declaring general-purpose parts (such as power cords and screws) as specialized parts, resulting in classification errors. Failure to indicate 'vehicle-mounted' use may result in classification under other medical equipment parts (although 902290 may still apply, it affects regulatory conditions). Confusing parts with complete machines, such as declaring an X-ray tube separately as 902290 when it should actually be classified under 902230. False declaration of brand and model, affecting customs valuation and traceability.

The core criteria for classification are: 1) whether the part is exclusively for equipment under heading 9022; 2) whether it is a general-purpose part. According to the Explanatory Notes to the Harmonized System, parts of 9022 include parts exclusively or principally for X-ray equipment, such as collimators, detectors, high tension generators, control panels, etc. If a part itself constitutes a complete device, it should be classified under the corresponding complete machine subheading. In addition, attention should be paid to Chapter 90 notes and heading texts to exclude articles specifically named in other headings (such as X-ray tubes under 902230). 902230 X-ray tubes: 902230 specifically refers to X-ray tubes, whether or not for medical use. 902290 covers other specialized parts, such as collimators and detectors. If the part is an X-ray tube, it must be classified under 902230. 902219 Other X-ray equipment (non-medical): 902219 covers complete machines for non-medical X-ray equipment, such as industrial flaw detection. 902290 covers parts and cannot be classified under a complete machine subheading. 902221 Medical alpha, beta, gamma ray equipment: 902221 covers complete machines for medical alpha, beta, gamma ray equipment. If specialized parts for such equipment are imported, they should be classified under 902290. 854390 Other electrical equipment parts: 854390 covers general-purpose electrical parts. If the part is a specialized radiation equipment part, it should be classified under 902290 with priority. 903300 Parts for other headings of Chapter 90: 903300 covers parts for other headings of Chapter 90 (such as optical instruments), while 902290 covers specialized parts for equipment under heading 9022. Is the part exclusively for equipment under heading 9022? Is the part a general-purpose part (such as screws and cables)? Does the part itself constitute a complete device (such as an X-ray tube)? Has it already been classified under a more specific heading based on material or function? Are you familiar with customs criteria for determining 'specialized parts'?

What is the difference in classification between vehicle-mounted radiation equipment parts and ordinary medical equipment parts? Vehicle-mounted radiation equipment parts still belong to radiation equipment parts, and the classification principle is the same, all classified under 902290. However, the 'vehicle-mounted' use may affect regulatory conditions (such as whether 3C certification is required), but the classification itself remains unchanged. Ordinary medical equipment parts that are not radiation equipment may be classified under other headings (such as 9018 or 9019). How to determine whether a part is exclusively for 9022 equipment? The main consideration is whether the part is used solely or principally for equipment under 9022 and cannot be used for other equipment. For example, a collimator is exclusively for X-ray machines and is a specialized part; a power cord may be general-purpose and is not a specialized part. Customs may require technical documentation to prove exclusivity. If the part is an X-ray tube but used in vehicle-mounted equipment, which code should it be classified under? X-ray tubes are classified under 902230 regardless of the equipment they are used in. Therefore, vehicle-mounted X-ray tubes should be classified under 902230, not 902290. 902290 applies only to other specialized parts. How should 'Use' be filled in during declaration to avoid classification disputes? The use should be specific to the equipment type and function, such as 'for vehicle-mounted X-ray radiography system, as a collimating component'. Avoid vague descriptions like 'medical use' or 'industrial use'. Also indicate the equipment model for customs verification. How to check the import tariff rate for 902290? You can consult the 'Customs Import and Export Tariff of the People's Republic of China' or the website of the General Administration of Customs, and determine it according to the latest tariff. The rate may vary depending on trade agreements, country of origin, etc. It is recommended to use customs advance classification or consult a professional customs broker. If a part is a general-purpose part but used in radiation equipment, can it be classified under 902290? No. General-purpose parts (such as screws and cables) should be classified according to their material (e.g., iron or steel screws under 7318). Only specialized parts are classified under 902290. If general-purpose parts and specialized parts are imported together, they should be classified separately. What regulatory documents are required for importing vehicle-mounted radiation equipment parts? It may involve import licenses for mechanical and electrical products, 3C certification (if applicable), import permits for radioactive materials, etc. It depends on the type and use of the parts. It is recommended to consult the local customs or refer to the 'Customs Regulatory Conditions'. How to distinguish between 902290 and 903300? 902290 covers specialized parts for heading 9022 (radiation equipment), while 903300 covers parts for other headings of Chapter 90 (such as optical and measuring instruments). If the part is exclusively for radiation equipment, it should be classified under 902290; if used for other instruments, it should be classified under 903300.