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A threaded insert, also known as a thread insert or helical insert, is a type of fastener used to repair or reinforce damaged or worn-out threads in a hole. Here’s how it works:
- Preparation of the Hole: If the existing threads in a hole are damaged or worn, the first step is to drill out the hole to a slightly larger diameter to remove the damaged material and create a clean surface for the insert.
- Tapping: After drilling, the hole is tapped with a special tap to cut new threads that match the outer threads of the threaded insert. The tap size corresponds to the outer diameter of the insert.
- Insert Installation: The threaded insert, which is typically made of metal and has internal threads that match the original size and pitch of the hole, is then screwed into the tapped hole. As it is turned into place, the insert’s external threads grip the newly tapped threads in the hole, providing a secure and durable connection.
- Securing the Insert: In some cases, especially in high-stress applications, the inserted coil may be secured with adhesive or locking compounds to prevent it from loosening over time.
Threaded inserts are commonly used in metalworking, automotive repair, aerospace, and other industries where threaded connections are critical and damaged threads can compromise the integrity of a component. They offer a cost-effective and reliable solution for restoring threads in a wide range of materials and applications.
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