What Causes Thread Failure in Self-Tapping Screws?

Self-tapping screws are primarily used in the home appliance manufacturing industry, wooden furniture, and steel structure engineering projects. Due to their strong self-locking capability, they do not require nuts and are simple and convenient to use, making them a popular choice. What causes thread failure in self-tapping screws after prolonged use?

1. The self-tapping screw may have corroded. Insufficient hardness can cause the threads to fail, so it is necessary to replace the screw with a new one.

2. Deformation caused by a combination of tensile and torsional forces. Torsional deformation can cause the screw to snap during threading, so the material’s shear strength must be greater than its tensile strength.

3. Inadequate bonding with the base metal. Poor adhesion can cause the threads to fail, so it is important to verify that the connection is correct.

All of the above situations can potentially lead to self-tapping screw thread failure. Therefore, when purchasing self-tapping screws, it is essential to choose a high-quality, reputable screw manufacturer.

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