Key locking insert is a special fastener with internal and external threads, and there are 2 or 4 pin keys on the external thread. Key locking insert  inserted into the bottom hole after tapping, and then 2 or 4 pins are pressed into the , play a strong fastening role.

1. Key locking insert can be divided into two types: ordinary type and locking type in terms of bolt locking function.

2. There are two types of internal thread for bolt inserts: metric and imperial.

3. From the size of the external thread, the key locking insert can be divided into thin-walled, heavy-duty, extra-heavy, etc., as well as imperial miniature, solid body, etc., as well as imperial internal threads, metric external threads, metric internal threads, imperial external threads, etc. .