Chapter 73 covers articles of iron or steel, but excludes primary steel materials of Chapter 72 (such as ingots, plates, bars, tubes, etc.) and mechanical and electrical products of Section XV. This chapter includes further processed articles of iron or steel, such as structural components, containers, cables, nails, screws, springs, kitchen and sanitary ware, etc. The core feature is that the goods already have specific shapes and uses and are no longer general semi-finished products. Heading 7318 specifically refers to fasteners such as screws, bolts, nuts, washers, etc., of iron or steel, which are basic components with large volume and wide application in international trade. Heading 7318 covers screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers and similar articles, of iron or steel. This heading is further subdivided by threaded and non-threaded, material, use, etc. 731819 is the 'other threaded articles' therein, namely threaded fasteners not listed in 731811 to 731818, including non-standard threads, special materials, or specially shaped threaded articles. Common examples include threaded rods, threaded pins, studs, etc. The first 2 digits '73' represent Chapter 73: articles of iron or steel, distinguished from Chapter 72 iron and steel raw materials. The 3rd-4th digits '18' represent heading 7318: fasteners such as screws, bolts, nuts, washers, etc., of iron or steel. The 5th-6th digits '19' represent subheading 731819: other threaded articles, namely threaded articles not listed in 731811 (coach screws), 731812 (other wood screws), 731813 (screw hooks), 731814 (self-tapping screws), 731815 (other screws and bolts), 731816 (nuts), 731817 (other washers), 731818 (rivets). This subheading is a residual item, covering non-standard threaded articles, special threaded rods, threaded pins, etc. The commodity is a threaded article of iron or steel, but it is neither a standard screw, bolt, nut, nor a washer or rivet, and it has threaded characteristics. Therefore, it cannot be classified under 731815 (other screws and bolts) or 731816 (nuts), nor does it belong to 731817 (washers) or 731818 (rivets). Within heading 7318, only 731819 'other threaded articles' can cover such non-listed threaded articles, such as threaded rods, threaded pins, studs, etc.

Product name: The specific name of the declared commodity, such as 'threaded rod', 'stud', 'threaded pin', etc., which should accurately reflect the characteristics of the commodity. Material: The specific type of iron or steel declared, such as 'carbon steel', 'alloy steel', 'stainless steel', etc., which affects classification and tariff rate. Thread type: Indicate whether the thread is metric, inch, pipe thread, etc., and whether it is self-tapping. Specifications and dimensions: Declare specific dimensions such as diameter, length, pitch, etc., such as 'M10×100mm'. Use: Explain the main use of the commodity, such as 'for mechanical connection', 'for construction', etc. Surface treatment: Declare whether it has been galvanized, blackened, painted, etc., which affects classification and anti-rust requirements. Brand and model: Declare the brand and model; if there is no brand, write 'no brand'. Packaging method: Declare the packaging form, such as 'bulk', 'boxed', etc., which affects inspection and statistics. Customs declaration example: Product name: Threaded rod Material: Carbon steel Thread type: Metric thread Specifications and dimensions: M12×200mm Use: For mechanical structural connection Surface treatment: Galvanized Brand and model: No brand, model A1 Packaging method: Bulk This commodity is a threaded rod of iron or steel, not a screw, bolt, or nut, and meets the definition of 731819 'other threaded articles'. Misclassifying threaded rods under 731815 (other screws and bolts), but 731815 specifically refers to screws and bolts, while threaded rods usually have no head and should be classified under 731819. Ignoring material distinctions; threaded articles of stainless steel may involve different regulatory conditions and must be accurately declared. Failure to declare the thread type; if it is a self-tapping thread, it should be classified under 731814, not 731819.

The core basis for classification is the Import and Export Tariff and the HS Explanatory Notes. First confirm that the commodity is of iron or steel, second confirm that it is threaded, and then determine whether it belongs to the specifically named screws, bolts, nuts, washers, rivets, etc. under heading 7318. If it belongs to none of them, classify it under 731819 'other threaded articles'. Note that 731819 only covers threaded articles; similar non-threaded articles should be classified under 731829 'other non-threaded articles'. Classification should also refer to material, use, dimensions, etc., but the main consideration is the characteristics of the commodity. 731815 Other screws and bolts: 731815 specifically refers to screws and bolts with heads, used for fastening; the threaded articles of 731819 usually have no head, such as threaded rods and studs, or although they have heads, they are not typical screws. 731816 Nuts: 731816 specifically refers to nuts, which have internal threads and are used to mate with bolts; the threaded articles of 731819 are not necessarily nuts and may be externally threaded rods or pins. 731829 Other non-threaded articles: 731829 covers non-threaded pins, keys, etc.; 731819 requires the commodity to be threaded, which is the core difference. 731814 Self-tapping screws: 731814 specifically refers to self-tapping screws, whose threads can tap by themselves; the threaded articles of 731819 usually have ordinary threads and are not self-tapping. 7307 Tube or pipe fittings of iron or steel: 7307 includes threaded pipe fittings, such as elbows and couplings, which, although threaded, are pipe connecting parts, whereas 731819 covers general fasteners. Is the commodity made of iron or steel? Does the commodity have threads? Does it belong to the specifically named screws, bolts, nuts, washers, rivets, etc.? Is it used for fastening or connection? Is it excluded from 731811-731818?

What is the difference between threaded rods under HS code 731819 and bolts under 731815? Bolts under 731815 usually have heads (such as hex heads) and are used with nuts for fastening; threaded rods under 731819 usually have no head and are a threaded rod used for connection or adjustment, such as studs. The key to classification is whether there is a typical head. Are threaded articles made of stainless steel also classified under 731819? Yes, 731819 covers threaded articles of various iron or steel (including stainless steel). However, note that stainless steel articles may have different regulatory conditions and tariff rates, and the material must be accurately stated when declaring. How can one determine whether a threaded article is classified under 731819 or 731829? The core difference is whether it has threads. 731819 requires the commodity to have threads, while 731829 covers non-threaded articles such as pins and keys. If the commodity has no threads, even if similar in shape, it should be classified under 731829. Can self-tapping screws be classified under 731819? No, self-tapping screws have a dedicated subheading 731814. 731819 is a residual item and applies only to threaded articles not specifically named. Because self-tapping screws have threads that can tap by themselves, they are already named and therefore are not classified under 731819. When declaring 731819, how should specifications and dimensions be filled in? Diameter, length, pitch, etc. should be filled in, such as 'M10×100mm'. Pitch may be omitted, but diameter and length must be provided so that customs can confirm the characteristics of the commodity. If it is an inch thread, it should be noted. Is the export tax rebate for 731819 different from that for 731815? The rebate rate may differ due to different codes, but the specific rate must be checked in the latest export tax rebate rate database. It is recommended to check through the customs or tax authority official website before declaration, or consult a professional customs broker. If a threaded article is used in automobiles, is it classified under 731819? If the threaded article is a part specially for automobiles and meets the definition of parts of Chapter 87, it may be classified under Chapter 87. However, general fasteners are usually still classified under 7318. It must be judged based on whether it is specially designed and the notes to Chapter 87. How can the import tariff rate for 731819 be checked? You can log in to the official website of the General Administration of Customs of China or use tools such as 'Customs Classification Expert' and enter the code to check the latest tariff rate. Note that the tariff rate may vary depending on trade agreements and country of origin.