Tapered on one end, these inserts are easy to guide into a hole during installation. The threaded rod on the other end creates an attachment point for components on plastic parts. For a secure hold in your part, two bands of diagonal knurls resist torque. Install these inserts by first drilling a hole and tapering the top half. Heat your insert on a hot plate and press the knurled end into the hole. The heat melts the surrounding plastic, which hardens around the knurls as it cools.

Brass inserts create a stronger fastening base than 3D printed or other plastic male threads, which wear down with frequent use. They’re also corrosion resistant, nonmagnetic, and can be used as electrical contacts.

Stainless steel inserts are stronger than brass inserts and they resist corrosion from mild chemicals and water better. They’re also lead-free, so they can be safely recycled along with the plastic part they’re installed in.

For technical drawings and 3-D models, click on a part number.