Carbon steel hardened thin head nickel plated electronic screw

Industry knowledge：

Why is grade 12.9 screw broken?

In the production of high-strength grade 12.9 screws, after the completion of cold forming and threading process, it is necessary to carry out hardening treatment. In the process of treatment, it is necessary to dehydrogenate the screws. If the dehydrogenation is not timely, it is easy to break when using, so the screws will break.