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Press Knocked Inserts

Press Knocked Inserts

Press knocked inserts, also known as press knocked or press-fit or heat-set inserts, are specialized fasteners used to create strong and reliable threaded connections in thermoplastic materials.

Purpose and Function:

The primary purpose of press knocked inserts is to provide a threaded connection in thermoplastic components. These inserts feature external threads and are designed to be press-fit or heat-set into pre-moulded or drilled holes in thermoplastic materials. Once installed, press knocked inserts create a secure and permanent threaded receptacle, allowing for the easy attachment of screws, bolts, or other fasteners.

Features and Benefits:

  1. Secure Threaded Connection:Press knocked inserts offer a reliable and secure threaded connection in thermoplastics, ensuring that fasteners stay in place even under load or vibration.
  2. Time and Cost Efficiency:The installation of press knocked inserts is quick and straightforward, reducing manufacturing time and assembly costs.
  3. Uniform Load Distribution:Press knocked inserts distribute load evenly across the plastic material, preventing stress concentrations and enhancing the component’s strength.
  4. Versatility:With various sizes, thread types, and materials available, press knocked inserts provide versatility for different thermoplastic applications.
  5. Material Compatibility:Press knocked inserts can be used with a wide range of thermoplastic materials, including ABS, PC, PE, PP, and more.


The installation process for press knocked inserts typically involves the following steps:

  1. Preparation:The thermoplastic component is moulded or drilled to create a hole with the appropriate size and depth for the press knocked insert.
  2. Insertion:The press knocked insert is positioned in the pre-moulded or drilled hole.
  3. Press-Fit or Heat-Set:The insert is either press-fit using a press tool or heat-set using thermal equipment. The pressing action or the application of heat causes the insert to melt into the surrounding thermoplastic, forming a secure and permanent threaded connection.


Press knocked inserts find applications in various industries, including electronics, automotive, consumer goods, and more. They are used in products like electronic enclosures, automotive components, furniture, and various other thermoplastic assemblies that require strong threaded connections.