Insert nuts

What are Insert nuts?

Insert nuts are a type of fastener commonly used to provide a threaded socket in a variety of materials, particularly in applications where the material itself cannot adequately support a standard screw or where disassembly is required. They are extensively used in furniture making, woodworking, and various industries where assembly and disassembly of components are necessary.


  1. Material: Insert nuts are typically made from metals like steel, brass, or zinc alloy, offering durability and strength. The choice of material often depends on the application and the environment in which the insert nut will be used.

  2. Design: They come in various designs, each suitable for different materials and applications. Common designs include:

    • Threaded: Have machine threads on the inside and coarse threads on the outside.
    • Knock-in: Designed to be knocked into the material, often having external barbs or ridges for grip.
    • Flanged: Include a flange at one end, which acts as a stopper and provides a larger surface area, distributing load more evenly.
  1. Thread Type: The internal thread can be metric, imperial, or designed for specific standards, depending on the bolts or screws they are intended to pair with.

  2. Installation: Most insert nuts are installed by either screwing them into a pre-drilled hole or knocking them in with a hammer. The installation method depends on the design of the insert nut.


Industrial Manufacutring Industry_web
Automotive Industry_web

Woodworking & Furniture

Widely used in flat-pack furniture and cabinetry for easy assembly and disassembly. Ideal for materials like MDF, particleboard, and softwoods where standard screws may not hold securely.

Electronics & Machinery

Used in electronic equipment and machinery where components need to be securely fastened but also easily removable for maintenance or upgrades.

Automotive & Aerospace

In these industries, insert nuts are used for components that require regular disassembly, offering a robust fastening solution.



  • Secure Fastening: Provide strong and reliable threaded connections in materials that are too soft or brittle to support threads.
  • Removability: Facilitate easy disassembly and reassembly, useful in applications where maintenance or upgrades are expected.
  • Versatility: Suitable for a wide range of materials and applications, with different types designed for specific needs.
  • Load Distribution: Some designs distribute the load over a larger area, reducing stress on the base material.


  • Material Compatibility: The choice of insert nut should be compatible with the material of the workpiece to ensure a secure fit.
  • Load Requirements: The load-bearing capacity of the insert nut should match the requirements of the application.
  • Installation Precision: Correct installation is crucial for the effectiveness of the insert nut, especially in terms of depth and alignment.



Type A Insert Nuts

  • Description: Knock-in, flush-fitting inserts with barbs for timber and board materials
  • Material: Zinc Alloy Die Cast
  • Applications: Audio equipment, cabinets, chairs, desks, shop equipment

Type B Insert Nuts

  • Description: Similar to Type A, but with a flange for surface holding
  • Material: Zinc Alloy Die Cast
  • Applications: Audio equipment, cabinets, chairs, desks, shop equipment

Type D Insert Nuts

  • Description: Screw-in, flanged insert for high resistance to pull-out and vibration
  • Material: Zinc Alloy Die Cast
  • Applications: Audio equipment, cabinets, chairs, desks, shop equipment

Type E Insert Nuts

  • Description: Self-tapping with no flange, suitable for curved and flat surfaces
  • Material: Zinc Alloy Die Cast
  • Applications: Audio equipment, cabinets, chairs, desks, shop equipment​

Type I Insert Nuts

  • Description: Coarse external tooth pattern for maximum holding power, with one end capped
  • Material: Zinc Alloy Die Cast
  • Applications: Audio equipment, cabinets, chairs, desks, tables, toys​

Type J Insert Nuts

  • Description: Suited for higher load applications with a load-spreading base and screw holes for added strength
  • Material: Zinc Alloy Die Cast
  • Finish: Yellow Zinc Passivate
  • Applications: Particularly suits Castor assembly applications​

Type X Insert Nuts

  • Description: Expanding insert nuts for high-strength fixing in various substrates
  • Material: Brass
  • Features: Expands against hole sides when the screw is driven
  • Applications: Ideal for a wide range of substrates

Knock-in Press In Type Insert Nuts

  • Description: Designed for low insertion forces with no damage to material on application
  • Material: Zinc Alloy Die Cast
  • Finish: Zinc and Clear Passivate
  • Applications: Suitable for applications requiring minimal insertion force

Type P Insert Nuts

  • Description: Self-tapping with a serrated external thread for high pull-out resistance
  • Material: Zinc Alloy Die Cast
  • Applications: Strong, permanent metal thread in wood and similar sheet materials

Installation and Use

Each insert nut type has a specific installation method, ensuring ease of use and reliability. The design of these nuts, like the coarse external tooth pattern in most types, ensures maximum holding power and simplified installation. Insert nuts are essential components in many industries, offering a practical solution for creating strong, removable, and reusable threaded joints in materials where traditional fastening methods are not viable.


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