Find HS Code and trade information for bolts and nuts

Bolts and Nuts

Bolts and nuts are threaded fasteners used to join materials together. They are essential components in a vast array of construction, mechanical engineering, and everyday applications.

Material

Bolts and nuts are manufactured from a variety of materials, selected based on strength requirements, environmental conditions, and cost:

• Carbon Steel: The most common material, offering good strength and affordability. Often coated with zinc, cadmium, or other finishes for corrosion resistance.
• Alloy Steel: Provides higher strength, toughness, and resistance to wear and temperature extremes than carbon steel. Used in critical applications.
• Stainless Steel: Offers excellent corrosion resistance and is suitable for outdoor or marine environments. Various grades (e.g., 304, 316) provide differing levels of resistance.
• Aluminum: Lightweight and corrosion-resistant, used in applications where weight is a concern.
• Brass: Corrosion-resistant and often used in plumbing and electrical applications.
• Titanium: Exceptionally strong, lightweight, and corrosion-resistant, used in aerospace and high-performance applications.

Purpose

The primary purpose of a bolt and nut is to create a strong, reliable mechanical connection between two or more components. They function by utilizing the threads to convert rotational motion into linear clamping force.

Function

A bolt and nut assembly works on the principle of clamping force. The bolt, with its helical threads, is inserted through aligned holes in the materials to be joined. The nut is then tightened onto the bolt, creating axial tension that pulls the materials together. This tension generates a clamping force perpendicular to the bolt axis, securely holding the components in place. The friction between the joined surfaces, and any additional washers used, contributes to the overall holding power.

Usage Scenarios

Bolts and nuts are used in a remarkably wide range of applications, including:

• Construction: Building structures, bridges, roads, and infrastructure.
• Automotive: Engine components, chassis assembly, body panels.
• Aerospace: Aircraft structures, engine components, landing gear.
• Machinery: Assembling equipment, securing components.
• Plumbing: Connecting pipes and fittings.
• Furniture: Assembling beds, chairs, tables.
• Electronics: Securing components in devices.

Common Types

Bolts and nuts are categorized by several factors, including head style, thread type, and material:

Bolts (by Head Style):

• Hex Head Bolts: The most common type, offering a large surface area for wrenching.
• Square Head Bolts: Older style, less common due to difficulty in wrenching.
• Round Head Bolts: Used for aesthetic applications where a flush finish is desired.
• Carriage Bolts: Feature a round head and a square shoulder, often used in wood applications.
• Flange Bolts: Feature a flange under the head, providing a larger bearing surface and increased clamping force.

Nuts (by Shape):

• Hex Nuts: The most common type, used with hex head bolts.
• Square Nuts: Older style, less common.
• Lock Nuts: Designed to resist loosening due to vibration (e.g., nylon insert lock nuts, prevailing torque nuts).
• Wing Nuts: Feature wings for easy hand tightening.
• Castle Nuts: Feature slots for use with cotter pins to prevent loosening.

Thread Types:

• Coarse Thread: Offers faster assembly and greater resistance to stripping.
• Fine Thread: Provides greater clamping force and is less likely to loosen due to vibration.
• Metric Threads: Utilizes millimeters for thread diameter and pitch.
• Imperial (UNC/UNF) Threads: Utilizes inches for thread diameter and pitch.

Bolts and nuts fall under the classification of screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel. The specific HS code depends on the diameter of the shank or threads and whether they are shipped together.

Here are the relevant HS codes based on the provided information:

• 7318152010: Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel: Threaded articles: Other screws and bolts, whether or not with their nuts or washers: Bolts and bolts and their nuts or washers entered or exported in the same shipment Having shanks or threads with a diameter of less than 6 mm.

  • 73: Iron or steel articles.
  • 18: Fasteners, screws, bolts, nuts, etc.
  • 15: Screws and bolts, whether or not with their nuts or washers.
  • 20: Other screws and bolts.
  • 10: Bolts and bolts and their nuts or washers entered or exported in the same shipment Having shanks or threads with a diameter of less than 6 mm.

• 7318152020: Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel: Threaded articles: Other screws and bolts, whether or not with their nuts or washers: Bolts and bolts and their nuts or washers entered or exported in the same shipment Having shanks or threads with a diameter of 6 mm or more: Track bolts.

  • 73: Iron or steel articles.
  • 18: Fasteners, screws, bolts, nuts, etc.
  • 15: Screws and bolts, whether or not with their nuts or washers.
  • 20: Other screws and bolts.
  • 20: Bolts and bolts and their nuts or washers entered or exported in the same shipment Having shanks or threads with a diameter of 6 mm or more: Track bolts.

Tax Information:

Both HS codes 7318152010 and 7318152020 share the following tax details:

• Basic Tariff: 0.0%
• Additional Tariff: 25.0%
• Tariff after April 2, 2025: 30.0%
• Additional Tariff for steel and aluminum products: 25%
• Total Tariff: 80.0%

Important Note:

The total tariff is 80.0% for both HS codes. Please verify the material composition (steel or aluminum) as an additional 25% tariff may apply.