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Moulded In Inserts

Moulded In Inserts

Moulded-in Inserts, also known as Moulding Inserts or Injection Moulding Inserts, are specialized fasteners used in plastic injection moulding processes. These inserts are designed to be embedded directly into plastic parts during the moulding process, creating a strong and permanent threaded connection within the plastic component. Moulded-in inserts offer several advantages and are widely used in various industries for their efficiency and reliability.

Purpose and Function:

The primary purpose of moulded-in inserts is to provide a threaded connection within plastic parts. By integrating the insert into the plastic component during the moulding process, a secure and permanent threaded receptacle is formed. This threaded receptacle allows for the easy attachment of screws, bolts, or other fasteners, making it possible to join plastic parts together or attach additional components.

Features and Benefits:

  1. Strong Threaded Connection:Moulded-in inserts create a strong threaded connection within the plastic component, ensuring durability and stability in the assembled product.
  2. Time and Cost Efficiency:The integration of inserts during the moulding process eliminates the need for post-moulding operations such as drilling or inserting separate fasteners, saving time and reducing manufacturing costs.
  3. Uniform Distribution of Stress:Moulded-in inserts distribute stress evenly throughout the plastic component, reducing the risk of cracking or failure under load.
  4. Versatility:Moulded-in inserts are available in various sizes and thread types, allowing for flexibility in design and application.
  5. Compatibility with Different Plastics:Moulded-in inserts can be used with different types of plastics, including thermoplastics like ABS, PC, PE, PP, and more.


The installation of moulded-in inserts is an integral part of the plastic injection moulding process. Here’s a brief overview of how they are installed:

  1. Mould Design:The mould used for injection moulding is designed to accommodate the moulded-in inserts. The inserts are positioned in the mould cavity in the desired locations where threaded connections are required.
  2. Injection Moulding:During the injection moulding process, molten plastic is injected into the mould cavity, encapsulating the moulded-in inserts.
  3. Cooling and Solidification:The molten plastic cools and solidifies, bonding with the moulded-in inserts to create a strong and permanent threaded connection.


Moulded-in inserts find applications in various industries, including electronics, automotive, aerospace, consumer goods, and more. They are used in products like electronic housings, automotive components, handles, knobs, and various other plastic parts that require threaded connections.