Self-tapping inserts are uniquely designed to cut threads during installation, so there is no need for pre-tapping. The working principle and threading process are as follows:
Threading Principle and Process of Self-Tapping Inserts:
External Threads and Cutting Grooves:
The outer surface of the self-tapping insert typically features threads and special cutting grooves or cutting edges. These cutting grooves allow the insert to cut threads into the base material as it is screwed in.
Preparation of the Installation Hole:
A pilot hole, slightly smaller than the outer diameter of the self-tapping insert, needs to be drilled into the base material. The size of the pilot hole is determined based on the specifications of the self-tapping insert.
Screwing in the Insert:
The self-tapping insert is aligned with the pilot hole, and then screwed into the hole using a screwdriver, installation tool, or power tool. As it is screwed in, the cutting grooves on the insert cut threads into the base material, forming new threads.
Self-Locking and Fixing:
Once the self-tapping insert is fully screwed in, its external threads tightly engage with the newly cut internal threads, achieving self-locking and securing the insert in place. After installation, the internal threads of the insert can be used to install standard screws or bolts.
Key Features:
Cutting Function: The cutting grooves or edges on the self-tapping insert are its core components, ensuring that it can cut threads during installation.
No Need for Pre-Tapping: The design of the self-tapping insert eliminates the need for traditional tapping procedures, simplifying the installation process.
Suitable for Various Materials: Self-tapping inserts can be used in a wide range of materials, including metals, plastics, and wood.
Using self-tapping inserts, users can achieve reliable threaded connections in softer materials without the need for additional tapping tools or steps.