How to test the hardness of self-tapping screws?

Sep 15,2022 / BY DEVELOPERS
Self-tapping screws seem to be a very small component, but in various industries, they play a pivotal role. From the production and research and development of smartphones to the construction of heavy machinery, self-tapping screws of different types and sizes are often used, and many friends need to know how to test the hardness of this screw.
People in the industry will first take a look at the surface hardness of self-tapping screws, which is one of the common and common test methods. Use a professional tool to tap the surface of the screw, from light to heavy, continuously and repeatedly, if it can still maintain a non-destructive appearance, it has passed the test.
High-level self-tapping screw core hardness is the second test step to be carried out next. Only if the industry standard hardness is maintained from the inside to the outside is a qualified product. Next, test the carburized layer to ensure that the surface hardness of the self-tapping screw is not doped with water. If the decarburization is too deep, accompanied by insufficient carburization, then when we use it for installation, it is very likely that the screw teeth will be greatly damaged.
After purchasing a brand of self-tapping screws, we can operate and screw in experiments by ourselves. Pick a high-quality steel plate and screw in the self-tapping screw clockwise to ensure that the force is moderate, and it does not have any thread damage or other deformation during the entire rotation process, which is enough to prove the high quality.
If you feel that testing the hardness of self-tapping screws is not professional enough, there are a variety of hardness testers available on the market, which can also provide more convincing test results. Whether it is using the above common test methods or using convenient tools to test, it is basically possible to judge whether the hardness of a certain brand of self-tapping screws has passed the test in a short time.