If there is a problem with the bottom hole of self-tapping insert, how can I repair it? Is there any repair skill?

The bottom hole of the self-tapping insert is not damaged. When the bolt is screwed in or out, the internal thread formed by the self-tapping insert is worn.

However, since the self-tapping insert is not properly disassembled when the self-tapping insert is removed, the self-tapping insert is directly pulled out by the pliers, so that it is easy to damage the threaded bottom hole of the self-tapping insert .

Also, the substrate is used in a highly corrosive environment, which may also cause corrosion of the self-tapping insert bottom hole and damage.

The self-tapping insert bottom hole is better to maintain after the wear, which is a double-layer self-tapping insert.

The self-tapping insert bottom hole of the worn self-tapping screw sleeve is reinstalled with a self-tapping insert, so that the internal thread formed conforms to the bottom hole of the self-tapping threaded sleeve, and is installed in the threaded bottom hole formed by the self-tapping screw sleeve. The tapping sleeve forms a standard internal thread.