| HS Code | Product Description | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|---|
| 7318160085 | Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel: Threaded articles: Nuts Other: Other | Doc | 62.5% | CN | US | 2025-05-12 |
| 8308909000 | Clasps, frames with clasps, buckles, buckle-clasps, hooks, eyes, eyelets and the like, of base metal, of a kind used for clothing or clothing accessories, footwear, jewelry, wrist watches, books, awnings, leather goods, travel goods or saddlery or for other made up articles; tubular or bifurcated rivets, of base metal; beads and spangles, of base metal: Other, including parts: Other | Doc | 57.7% | CN | US | 2025-05-12 |
| 8487900080 | Machinery parts, not containing electrical connectors, insulators, coils, contacts or other electrical features, and not specified or included elsewhere in this chapter: Other Other | Doc | 83.9% | CN | US | 2025-05-12 |
Hexagon Screw Nut
A hexagon screw nut, commonly referred to as a hex nut, is a fastener with a hexagonal shape used to connect components, typically with a bolt or screw. It is one of the most prevalent types of nuts used across a wide range of applications.
Material
Hex nuts are manufactured from a variety of materials, selected based on the required strength, corrosion resistance, and application environment. Common materials include:
- Steel: Carbon steel is the most common material, offering high strength and affordability. Often coated with zinc, cadmium, or other finishes for corrosion protection.
- Stainless Steel: Provides excellent corrosion resistance, suitable for outdoor or wet environments. Common grades include 304 and 316.
- Alloy Steel: Used for high-strength applications requiring increased durability and resistance to extreme temperatures.
- Nylon (Plastic): Used in applications where electrical insulation or vibration dampening is required.
- Brass: Offers good corrosion resistance and conductivity, often used in plumbing and electrical applications.
Purpose
The primary purpose of a hex nut is to secure two or more parts together by applying clamping force when tightened onto a threaded fastener (bolt or screw). It distributes the clamping force evenly, preventing loosening and ensuring a strong connection.
Function
A hex nut functions by converting rotational motion into linear clamping force. The threads on the nut engage with the threads of the bolt or screw. As the nut is turned, it moves along the threads, drawing the connected components together. The hexagonal shape allows for efficient tightening with a wrench or socket.
Usage Scenarios
Hex nuts are utilized in an extremely broad spectrum of applications, including:
- Construction: Framing, structural connections, machinery assembly.
- Automotive: Engine components, chassis assembly, suspension systems.
- Manufacturing: General assembly, equipment mounting, fastening of components.
- Plumbing: Connecting pipes and fittings.
- Furniture: Assembly of beds, tables, chairs.
- Electronics: Securing components in electronic devices.
Common Types
- Standard Hex Nut: The most common type, with a consistent hexagonal shape.
- Lock Nut: Designed to resist loosening due to vibration. Types include:
- Nylon Insert Lock Nut (Nylock Nut): Features a nylon insert that deforms around the bolt threads, creating friction.
- Prevailing Torque Nut: Utilizes a deformed thread or other mechanism to increase friction.
- Castle Nut: Features slots for a cotter pin to prevent rotation.
- Flange Nut: Features a flange at the base, providing a larger bearing surface and increased clamping force.
- Square Nut: Features a square shape, less common than hex nuts but still used in some applications.
- K-Lock Nut: Features a slotted base that grips the bearing surface.
- Cap Nut: Features a domed or conical end for aesthetic or safety purposes.
Based on the provided information, hexagon screw nuts fall under the classification of nuts made of iron or steel.
Here are the relevant HS codes:
- 7318160085: This HS code covers screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel. Specifically, it pertains to threaded articles, and further specifies nuts, categorized as 'Other'.
- 73: Chapter 73 relates to articles of iron or steel.
- 18: Heading 7318 covers screws, bolts, nuts, coach screws etc.
- 16: Subheading 731816 covers threaded articles, specifically nuts.
- 0085: This further specifies the categorization as 'Other'.
Tax Details: The base tariff is 0.0%, with an additional tariff of 7.5%. After April 2, 2025, the additional tariff increases to 30.0%. A further 25% additional tariff applies to steel and aluminum products. Total Tax Rate: 62.5%
Important Note: Regarding HS code 7318160085, please note that the total tax rate is 62.5% and will change after April 2, 2025, potentially increasing to a higher rate depending on the material (steel or aluminum).