Screwfit - Long - M4

The Long Screwfit insert is a high-strength brass self-tapping threaded insert designed for demanding applications requiring maximum thread engagement and superior retention in plastics and composite materials. Installed post-mould, these screw-in inserts incorporate three cutting flutes along the external thread form, ensuring a balanced cutting action for efficient installation and consistent thread formation.

Suitable for cold installation into most grades of thermoplastics, thermosets and composite materials, the Long Screwfit Insert delivers outstanding torque resistance and pull-out performance. Its unheaded design allows for a flush-fit finish, making it ideal for applications where both strength and appearance are important. The increased insertion length provides greater surface contact with the parent material, helping to maximise load-bearing capacity and long-term fastening reliability.

Common applications include automotive components, industrial machinery, electrical enclosures, composite assemblies and heavy-duty plastic parts. For applications with lower load requirements, consider the Short or Regular Screwfit insert variants, which offer the same trusted performance in shorter installation lengths.