Press-in expansion threaded insert (UPLK)

ATS supplies threaded inserts for plastics and provides technical support to help customers identify the most suitable fastening solution according to the material, assembly requirements and application conditions.

Unlike standard plastic threads, a brass threaded insert provides a stable metal thread that can withstand repeated assembly and disassembly operations while maintaining reliable performance throughout the component’s service life.

The UPLK insert is installed by pressing it into a prepared hole within the thermoplastic component. During installation, the expansion mechanism creates a mechanical lock inside the material, while the external knurling and retaining features improve grip and resistance against movement.

This design provides a secure connection with good resistance to pull-out forces and rotational loads, making the insert suitable for applications where reliable fastening is required without using heat installation processes.

The UPLK series has been developed for applications requiring a practical and effective way to introduce a durable threaded connection into plastic components.

Main advantages include:

• manufactured from brass for good mechanical performance, durability and dimensional stability;
• simple press-in installation without heating or ultrasonic equipment;
• expansion locking system for improved retention inside thermoplastic materials;
• external knurling designed to increase holding strength;
• suitable for a wide range of soft and medium-hard thermoplastics;
• provides a reliable metal thread for repeated screw installation.

The UPLK expansion insert is an effective alternative when a simple, fast and dependable fastening method is required for plastic assemblies.

Brass threaded inserts for plastic are widely used across industrial sectors where lightweight polymer components require stronger fixing points.

Typical applications include:

• injection moulded plastic components;
• technical housings and covers;
• electrical and electronic equipment;
• industrial devices and machinery components;
• automotive and mechanical plastic assemblies.

By introducing a metal thread into a plastic component, threaded inserts help improve assembly reliability and reduce the risk of thread damage during maintenance or repeated servicing operations.

The correct insert choice depends on several factors, including the type of thermoplastic material, component design, wall thickness, screw size, installation method and required mechanical performance.

Different technologies are available for plastic fastening applications, including press-in inserts, heat-set inserts, ultrasonic inserts and self-tapping inserts. Each solution offers different advantages depending on the specific application requirements.

For this reason, the selection process should always consider the complete assembly rather than only the insert itself.

ATS supplies threaded inserts for thermoplastics and supports customers in identifying the most appropriate solution for their application.

Our technical approach focuses on understanding the real working conditions of the component, including the plastic material, assembly process and performance requirements, in order to recommend the most suitable insert solution.

Whether you need a standard brass threaded insert or support in evaluating the correct fastening technology, ATS Lamberti provides technical assistance throughout the selection process.

The technical datasheet for the UPLK expansion threaded insert is available within the documentation dedicated to brass threaded inserts for plastic applications.