Why are the 12.9 socket head cap screw easy to break?

I believe that many people have experienced the situation that the screws are easy to break when using 12.9 socket head cap screw, so why is this?

Generally, when producing such high-strength 12.9 socket head cap screw, after completing the steps of heading and rubbing teeth, it is necessary to perform heat treatment, that is, the process of hardening. Then there is the surface treatment.

In the process of hydrogen removal, if it is not treated in time, hydrogen embrittlement will occur. In addition, if the hydrogen is removed in time, but if the hydrogen is not removed completely, hydrogen embrittlement will also occur. This kind of high-strength screw is easy to break when it is used.

In addition to excluding the breakage of the screw caused by hydrogen embrittlement, the deep groove of the screw will also cause the screw to break easily, or the design problem of the R angle under the head, the torque problem during use, etc. will cause the screw to break. The reason for the broken head.

Therefore, when the non-standard 12.9 cap screw breaks, it is necessary to take pictures or videos to the screw manufacturer, and they can generally determine the reasons for the broken ends of the 12.9 screws from the pictures or videos taken.

Do you still want to know what causes the 12.9 socket head cap screw to break easily? Feel free to contact Shi Shi Tong screw manufacturers at any time.

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