What problems will occur if the type a self tapping screw is too hard?

Hello everyone, a few days ago, a customer said that the screws he ordered before were always assembled with broken ends during use, so he asked Shi Shi Tong carbon steel self-tapping screw manufacturer to help do an analysis test. Let’s see why this screw is broken. This is a heat-treated type a self tapping screw with dacromet silver plating on the surface.

Through testing, the manufacturer of Shi Shi Tong carbon steel self-tapping screws found that the degree of hardening of the type a self tapping screw is too high. The current detected data is concentrated at about 457 degrees. According to national standards, it is generally between 274-425 .

If the hardness of the type a self tapping screw is too high, it will easily cause brittle fracture. Other torques can be satisfied after passing the test. The standard is 10N, and the model can only be broken when it reaches 11N.

In addition, the materials currently on the market are selected in different regions, and the content of possible ingredients is also different. Some factories will use 20 Meng materials instead of materials to make self-tapping screws, which will also lead to unstable performance.

Therefore, when ordering type a self tapping screw, don’t think that the higher the hardness, the better. The higher the hardness, the easier it will be brittle, even for other screws. It is necessary to choose the appropriate hardness to assemble the accessories, which will save costs and do not require rework back and forth.

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