Chapter 84 is the core chapter in HS classification covering machinery, mechanical appliances and their parts, including power machinery, metalworking machine tools, industrial robots, office equipment, automatic data processing equipment, etc. This chapter emphasizes the mechanical function and power-driven characteristics of goods, and is the most important chapter for the classification of mechanical and electrical products in international trade. Heading 8459 covers metal cutting machine tools, specifically including machine tools that process by removing metal material, such as milling machines, boring machines, tapping machines, etc. Machine tools under this heading typically feature power drive, tool rotation or workpiece movement, and are used for precision machining of metal workpieces. The first 2 digits 84 indicate Chapter 84 (machinery, mechanical appliances). Digits 3-4, 59, indicate heading 8459 (metal cutting machine tools). Digits 5-6, 21, are the subheading, indicating CNC milling machines. Subheading 21 is further limited to Numerical Control milling machines, distinguished from other non-NC milling machines (such as subheading 8459.31, etc.). Therefore, the complete meaning of 845921 is: CNC milling machines under the metal cutting machine tools heading of Chapter 84. This commodity is a CNC milling machine with digital control function, used for metal cutting processing, conforming to the description of heading 8459. It is not classified under 8457 (machining centers) because machining centers typically have automatic tool change functions and can perform multi-process machining; it is not classified under 8460 (grinding machines) because milling and grinding have different processing principles; it is not classified under 8462 (forging and pressing machines) because it involves cutting rather than forming processing.

Product Name: The specific name of the declared commodity, which should be accurately described as "CNC milling machine," avoiding colloquial or vague names. Brand: Fill in the manufacturer or brand name, such as "DMG MORI," "Haitian," etc., which must match the physical nameplate. Model: Fill in the specific model, such as "VMC850," used to distinguish different specifications of equipment under the same brand. Control Method: Specify whether it is CNC, fill in "CNC" or "non-CNC," and indicate the control system brand (such as FANUC, SIEMENS). Processing Object: Specify the main processing material, such as "metal," "plastic," etc. CNC milling machines are typically used for metal processing. Number of Spindles: Fill in the number of spindles, such as "single spindle" or "multi-spindle," affecting subheading determination. Power: Fill in the main motor power (kW), used to confirm whether it belongs to large machine tools or special machine tools. Origin: Fill in the equipment production location, such as "Germany," "China," affecting tariff and trade agreement applicability. Product Name: CNC milling machine; Brand: DMG MORI; Model: DMU 50; Control Method: CNC, FANUC system; Processing Object: Metal; Number of Spindles: Single spindle; Power: 15kW; Origin: Germany. Misreporting CNC milling machines as machining centers (8457), leading to classification errors. Not providing control system information, unable to prove its CNC characteristics. Ignoring the number of spindles, which may affect subheading determination.

Core basis for classification: 1. The commodity function is metal cutting processing; 2. It has a digital control (NC/CNC) system; 3. The processing method is milling (rotating tool movement or workpiece movement); 4. It is not a machining center (no automatic tool change or multi-process integration). Also refer to the description of 8459 in the "Explanatory Notes to the Harmonized System." 8457 Machining Centers: Machining centers typically have automatic tool change devices and can perform multi-process machining; while 845921 refers only to CNC milling machines, generally without automatic tool change or with only simple tool change. 8458 CNC Lathes: CNC lathes use workpiece rotation as the main motion, with the tool moving linearly; CNC milling machines use tool rotation as the main motion, with the workpiece or tool moving. 8460 Grinding Machines: Grinding machines use abrasive tools for finishing, while milling machines use milling cutters for cutting; the processing principles and tools are different. 8462 Forging and Pressing Machines: Forging and pressing machines form metal through pressure, belonging to chipless processing; milling machines remove material through cutting, belonging to chip-producing processing. Does it have a CNC system? Is it used for metal cutting? Is milling the main processing method? Does it have automatic tool change function? Is it classified under 8459 rather than 8457?

What is the difference in HS codes between CNC milling machines and machining centers? CNC milling machines are typically classified under 845921, while machining centers are classified under 8457. Machining centers have automatic tool change devices and can automatically change tools for multi-process machining; CNC milling machines generally have no automatic tool change or only manual tool change, with relatively single processing procedures. How to determine whether a milling machine is a CNC milling machine? Check whether the equipment is equipped with a CNC system (such as FANUC, SIEMENS, etc.) and can control the processing through programs. If it is only manually operated or mechanically profiled, it is not a CNC milling machine. In the declaration elements of CNC milling machines, is the control system brand mandatory? Yes, the control system brand is an important basis for proving that the equipment is CNC, and customs may require it to confirm classification. It is recommended to indicate the control system brand and model when declaring. If a CNC milling machine has both milling and turning functions, how should it be classified? If the equipment is mainly for milling and has CNC, it can still be classified under 845921; if it is mainly for turning, it is classified under 8458. If it is a composite machining center, it may be classified under 8457. Judgment should be based on the main function. Is the HS code for used CNC milling machines the same as for new equipment? Yes, the HS code does not change based on new or used condition and remains 845921. However, when declaring, it should be noted as used equipment and relevant condition descriptions should be provided. How to inquire about the tariff rate for CNC milling machines? You can consult the "Customs Import and Export Tariff of the People's Republic of China" or inquire through the General Administration of Customs website or the International Trade Single Window. The tariff rate may vary depending on origin, trade agreements, etc. It is recommended to refer to the latest tariff schedule. Does the export of CNC milling machines require an export license? It depends on the technical parameters of the equipment and the export destination. Some high-precision CNC milling machines may be subject to export controls and require a license. It is recommended to consult the local commerce department or customs. Is the classification of CNC milling machines affected by the processing material? Heading 8459 explicitly covers metal cutting machine tools. If used for processing non-metals (such as wood, plastic), it may be classified under 8465 (machine tools for processing wood, plastic, etc.). Therefore, the processing material is an important basis for judgment.