| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8301600000 | Doc | 40.3% | CN | US | 2025-05-12 |
| 8308909000 | Doc | 57.7% | CN | US | 2025-05-12 |
| 7318160085 | Doc | 62.5% | CN | US | 2025-05-12 |
Hexagon Long Nut
A hexagon long nut, also known as a long hex nut, is a fastener with a hexagonal outer shape and an extended threaded portion. It is designed for applications requiring a longer thread length than standard nuts allow.
Material
Hexagon long nuts are commonly manufactured from:
- Steel: Carbon steel is the most frequently used material due to its strength and affordability. Often coated with zinc, cadmium, or other finishes for corrosion resistance.
- Stainless Steel: Provides excellent corrosion resistance, suitable for outdoor or wet environments. Common grades include 304 and 316 stainless steel.
- Alloy Steel: Used for high-strength applications, often heat-treated for increased durability.
- Brass: Offers good corrosion resistance and conductivity, but generally lower strength than steel.
- Nylon/Plastic: Used in applications where electrical insulation or corrosion resistance is paramount, but with significantly reduced strength.
Purpose
The primary purpose of a hexagon long nut is to secure bolts, screws, or studs, providing a strong and reliable fastening solution. The extended thread length allows for:
- Increased clamping force: The longer thread engages more of the bolt's length, distributing the clamping force more evenly.
- Fastening thicker materials: Accommodates materials with greater thickness than standard nuts can handle.
- Spacing components: The extended length can create a gap or space between components.
- Adjustability: Allows for more precise adjustment of the fastened assembly.
Function
Hexagon long nuts function by applying compressive force to the materials being joined when tightened onto a threaded fastener. The hexagonal shape allows for tightening and loosening with a wrench or socket. The threads engage with the corresponding threads on the bolt, creating a secure connection.
Usage Scenarios
- Construction: Securing structural components, attaching heavy machinery, and fastening timber framing.
- Automotive: Attaching exhaust systems, securing suspension components, and fastening body panels.
- Plumbing: Securing pipes and fittings, attaching valves and pumps.
- Furniture Assembly: Connecting wooden components, securing metal frames.
- Machinery: Securing various components in industrial equipment.
- Electrical Applications: Used with bolts to mount electrical components, often with nylon or plastic versions for insulation.
Common Types
- Grade 2/Coarse Thread: General purpose, lower strength.
- Grade 5/Medium Strength: Commonly used in automotive and general machinery applications.
- Grade 8/High Strength: Used in critical applications requiring high clamping force and durability.
- Lock Nuts: Designed to resist loosening due to vibration. Types include:
- Nylon Insert Lock Nuts (Nylock Nuts): Feature a nylon insert that deforms around the bolt threads, creating friction.
- Prevailing Torque Nuts: Utilize a deformed thread or other mechanism to resist loosening.
- Flange Nuts: Feature a flange at one end, providing a larger bearing surface and increased stability.
- Castle Nuts: Feature slots cut into the end, allowing for cotter pins to be inserted for added security.
- Square Flange Nuts: A combination of flange and square features for increased stability.
Based on the provided information, hexagon long nuts fall under the classification of screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers and similar articles, of iron or steel.
Here's a breakdown of the relevant HS code:
-
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; Threaded articles; Nuts Other; Other.
- 73: Chapter 73 pertains to articles of iron or steel.
- 18: Heading 7318 specifically covers screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers and similar articles.
- 16: Subheading 731816 focuses on threaded articles, specifically nuts.
- 0085: This further specifies "Other" within the category of nuts.
Tax Details:
- 基础关税 (Basic Tariff): 0.0%
- 加征关税 (Additional Tariff): 7.5%
- 2025.4.2后加征关税 (Additional Tariff after 2025.4.2): 30%
- 钢,铝制品加征关税 (Additional Tariff for steel and aluminum products after 2025.4.2): 25%
- 总税率 (Total Tariff): 62.5%
Important Note: According to the provided reference material, for HS code 7318160085, please note the need to verify the material (steel or aluminum) as the additional tariff rate differs after 2025.4.2.