Chapter 83 covers various articles of base metal, but excludes tools and knives of Chapter 82 and mechanical appliances of Chapter 84. This chapter mainly includes base metal building components, locks, hinges, decorative pieces, and various miscellaneous articles of base metal. Its core feature is that these articles are usually made of base metals (such as iron, steel, copper, aluminum, etc.) and are not classified under other more specific chapters. Heading 8301 specifically covers locks and locking devices, reflecting the application of base metals in the fields of security and fastening. Heading 8301 covers locks and locking devices of base metal, including padlocks, key locks, combination locks, and various other locks and locking pieces. This heading includes both locks used independently and locking devices used for luggage, vehicles, and buildings. However, it should be noted that this heading does not include locks specifically for furniture or doors and windows (which should be classified under 8302 or 8303, etc.), nor does it include electronic locks (which may be classified under 8543 or 8531). Lock washers, as fasteners of base metal, are also classified under this heading because they have a locking function. First 2 digits 83: Represents Chapter 83 'Miscellaneous articles of base metal', indicating that the goods belong to finished articles of base metal but are not classified under other more specific chapters. Digits 3-4 01: Represents heading 8301 'Locks and locking devices', covering various locks and locking pieces. Digits 5-6 50: Represents subheading 830150 'Lock washers', specifically referring to washers used to prevent bolts or nuts from loosening, usually made of spring steel, with elastic or toothed structure. This subheading further refines the types of locking devices, distinguishing lock washers from other locks, facilitating customs statistics and supervision. Lock washers are classified under 830150 because they are locking devices of base metal, whose function is to prevent fasteners from loosening, consistent with the description of heading 8301 'Locks and locking devices'. Compared with adjacent codes, they are different from ordinary washers (classified under 7318, as fasteners of iron or steel) and also different from springs (classified under 7320), because lock washers have a specific locking function and are usually used with bolts. Therefore, 830150 is the code specifically for such washers with a locking function.

Product name: Declare the Chinese and foreign names of the goods, which should be accurately described as 'lock washer' or 'spring washer', etc., avoiding the use of the general term 'washer'. Material: Declare the specific type of base metal, such as 'carbon steel', 'stainless steel', 'copper', etc., and indicate whether surface treatment (such as galvanizing) has been applied. Use: Explain the usage scenario of the lock washer, such as 'for bolt anti-loosening', 'for mechanical assembly', etc., to prove its locking function. Structure type: Describe the structure of the lock washer, such as 'spring type', 'toothed', 'waveform', etc., and whether it has elasticity. Dimensions: Declare dimensions such as inner diameter, outer diameter, thickness, etc., so that customs can confirm the specifications. Brand: Declare the brand name (if any); if no brand, fill in 'no brand'. Model: Declare the product model or item number for easy identification. Standard: Declare the implemented standard, such as 'GB/T 93', 'DIN 127', etc., reflecting the product specifications. Product name: Lock washer (spring washer); Material: Carbon steel, galvanized; Use: For bolt anti-loosening; Structure type: Spring type; Dimensions: Inner diameter 8mm, outer diameter 15mm, thickness 2mm; Brand: No brand; Model: DIN127; Standard: DIN 127. Misreporting lock washers as ordinary washers (7318), leading to classification errors. Material declaration is not specific, such as only writing 'iron', without distinguishing carbon steel or stainless steel. The use description does not reflect the locking function, such as writing 'for connection', which may be classified under other codes.

The core basis for classification is the function and material of the goods. Lock washers must be made of base metal and have the locking function of preventing fasteners from loosening. Their structure usually has elasticity or teeth, and the difference from ordinary washers lies in their locking characteristics. According to HS notes, 8301 includes lock washers, while ordinary washers are classified under 7318. Therefore, when determining, it is necessary to confirm whether the goods are specifically used for locking, rather than merely as a gasket. 7318 Iron or steel fasteners: 7318 covers screws, bolts, nuts, washers, etc., but ordinary washers have no locking function, while lock washers of 830150 have anti-loosening function. 7320 Iron or steel springs: 7320 includes various springs, but although lock washers have elasticity, their main function is locking, not used as springs. 8302 Other locking devices of base metal: 8302 includes locking pieces for doors, windows, and furniture, while 830150 specifically refers to lock washers, with a more specific use. 8483 Transmission shafts and cranks, etc.: 8483 includes mechanical transmission components, but lock washers are fasteners and do not belong to transmission components. Is the product made of base metal? Does the product have a locking function? Is the product specifically used to prevent bolts or nuts from loosening? Is the product distinguished from ordinary washers? Is the product not classified under other more specific codes?

What is the difference in HS codes between lock washers and ordinary washers? Lock washers are classified under 830150 because they have a locking function and belong to locking devices; ordinary washers are classified under 7318 as general fasteners. The key difference lies in function: lock washers are used for anti-loosening, while ordinary washers are used to distribute pressure or seal. How to determine whether a washer is a lock washer? Mainly look at whether its structure has elasticity or teeth, and whether it is used to prevent bolts from loosening. Common spring washers and toothed washers are lock washers. If it is only a flat washer, it is not. Which code should stainless steel lock washers be classified under? Still classified under 830150, because this code is classified by function and does not distinguish material. However, the material should be indicated as stainless steel during declaration for customs inspection. How to distinguish between lock washers and springs in classification? Lock washers are classified under 830150, and springs under 7320. The distinction lies in use: lock washers are used for fastener anti-loosening, while springs are used to store energy or buffer. If the main function of the washer is locking, it is classified under 830150. What elements need to be declared for lock washers during customs declaration? Need to declare product name, material, use, structure type, dimensions, brand, model, standard, etc. Focus on explaining the locking function and material to avoid classification disputes. How to check the tariff rate for lock washers? The latest tariff rates can be queried through the official website of the General Administration of Customs or the International Trade Single Window. Tariff rates vary by country and trade agreement, and it is recommended to rely on actual query results. If lock washers are used in automobiles, are they classified under other codes? Still classified under 830150, unless they are parts specifically for automobiles and classified under Chapter 87. However, general lock washers, as universal fasteners, do not change codes because they are used in automobiles. What issues should be noted when exporting lock washers? Ensure that the declared elements are accurate, especially material and use. Also pay attention to the access requirements of the destination country, such as standard certification. It is recommended to keep product specification sheets for inspection.