Chapter 84 is the core chapter in HS classification covering mechanical appliances and parts, including power machinery, metalworking machine tools, industrial processing machinery, office equipment, automatic data processing equipment and their parts and components. This chapter emphasizes the function and use of machines rather than material properties. For machine parts, classification requires determining whether they belong to a specific heading's parts or constitute a machine with independent function. Chapter notes and exclusion clauses impose strict limitations on parts classification, for example, parts of 84.77 apply only to rubber or plastics working machines. Heading 8477 covers rubber or plastics working machines as defined in the notes to this chapter, including injection molding machines, extruders, blow molding machines, calenders, compression molding machines, etc., as well as other machines for working rubber or plastics. This heading also includes parts of the above machines, but they must meet the condition of being "solely or principally for" machines under 8477. If the parts themselves are general-purpose parts (such as bolts, gears), they should be classified according to their material or as general-purpose parts, unless they are clearly solely for rubber or plastics machinery. Code 847790 consists of 6 digits. The first 2 digits "84" represent Chapter 84, i.e., nuclear reactors, boilers, machinery, mechanical appliances and their parts. Digits 3-4 "77" represent heading 8477, i.e., rubber or plastics working machines and parts thereof as listed in the notes to this chapter. Digits 5-6 "90" represent subheading 847790, i.e., "parts", specifically referring to parts for machines under heading 8477. Therefore, the complete meaning of 847790 is: dedicated parts for rubber or plastics working machines. This subheading does not distinguish specific machine types; as long as the parts are solely for machines under 8477, they can be classified herein. This commodity is a part for rubber or plastics working machines, whose parent machine belongs to heading 8477, and the part is solely for that parent machine, therefore classified under 847790. If the part is a general-purpose part (such as standard bolts, bearings), it should be classified according to its material (e.g., iron or steel bolts under 7318). If the part itself constitutes an independent machine, it should be classified under the corresponding heading. Only parts meeting the condition of "solely or principally for" 8477 machines are classified under this code.

Product Name: The specific name of the declared commodity, which should accurately reflect the function, material, and use of the part, such as "injection molding machine screw", "extruder barrel". Use: Clearly specify the type of machine the part is applicable to and the processing object, such as "for injection molding machines, processing plastic products". Material: The main material of the declared part, such as alloy steel, stainless steel, hard alloy, etc., which affects classification and customs valuation. Brand: Fill in the brand of the part; if no brand, indicate "no brand", which affects customs intellectual property protection. Model: Fill in the model or specification of the part, facilitating customs identification and valuation. Whether Dedicated Part: Declare whether the part is solely for machines under 8477, which is key to classification under this code. Country of Origin: Fill in the country (region) of origin of the part, which affects tariffs and trade policies. Product Name: Alloy steel screw for injection molding machine; Use: For Haitian brand injection molding machine, processing plastic products; Material: Alloy steel; Brand: Haitian; Model: HT-120; Whether Dedicated Part: Yes; Country of Origin: China. Incorrectly classifying general-purpose parts (such as standard bolts) under 847790; they should be classified according to material. Failure to provide parent machine model or use, unable to prove dedication, resulting in rejection or inspection. Inaccurate material declaration, such as declaring alloy steel as stainless steel, which may trigger classification disputes.

The core basis for classification is whether the part is solely or principally for rubber or plastics working machines under 8477. According to Chapter 84 notes and General Rules for Interpretation, if the part meets the dedication requirement, it is classified under 847790; if it is a general-purpose part, it is classified according to material. Reference should also be made to the Explanatory Notes to the Harmonized System for 8477 parts, as well as relevant classification decisions of the General Administration of Customs. 847790 Parts for rubber or plastics working machines: This code, for parts solely for 8477 machines, must meet the dedication requirement. 848790 Other machine parts: For machines under 8487 (such as non-electrical machine parts), not applicable to rubber or plastics working machines. 731815 Iron or steel bolts: General-purpose bolts, even if used in 8477 machines, should be classified according to material, unless specially designed. 847710 Injection molding machines: Complete injection molding machines are classified under 847710, their parts under 847790. 847720 Extruders: Complete extruders are classified under 847720, their parts under 847790. Is the part solely for machines under 8477? Does the part constitute an independent machine? Is the part a general-purpose part (such as standard parts)? Has the parent machine model and use certification been provided? Are material and brand accurately declared?

How to determine whether a part is solely for rubber or plastics working machines? Mainly check whether the part is specifically designed for machines under 8477 and cannot be used for other machines. Usually requires providing parent machine model, drawings, manuals, etc. If the part is general-purpose, it is classified according to material. Does it affect classification if 847790 parts are imported unassembled? No. As long as the part itself meets the dedication requirement, it is classified under 847790 regardless of whether it is assembled. However, if the complete set of knocked-down parts constitutes a complete machine, it should be classified as a complete machine. Does 847790 include electrical parts? No. Electrical parts such as motors, controllers, etc., even if used in 8477 machines, should be classified as electrical parts (such as 8501, 8537). 847790 only includes mechanical parts. How to check the import tax rate for 847790? You can check through the Customs Tariff Query System of the General Administration of Customs or the China Customs Import and Export Tariff by entering code 847790 to view MFN rate, general rate, VAT rate, etc. Note that rates may change; refer to the latest announcements. Does the export of 847790 parts require commodity inspection? Generally not required, but if involving special equipment or endangered materials, procedures must be handled according to regulations. It is recommended to check the Export Commodity Inspection Catalog of the General Administration of Customs. How to distinguish 847790 from 848790? 847790 is solely for rubber or plastics working machines (8477), 848790 is for other machines (8487). The key is the parent machine type; if the parent machine is under 8477, the parts are classified under 847790. If a part is a general-purpose item but solely for 8477 machines, can it be classified under 847790? No. General-purpose items such as standard bolts and gears, even if solely for 8477 machines, should be classified according to material (such as 7318, 8483). Only non-general-purpose parts solely for 8477 machines are classified under 847790. What are the key points of customs valuation for 847790 parts upon import? Key valuation points include: whether the part is dedicated, material, brand, model, country of origin, and whether the transaction price is genuine. If the declared price is significantly low, customs may question and revalue.