We can go to a specialized heat treatment manufacturer to test the hardness after heat treatment. We can randomly select metric nuts and break them in the middle to test their core hardness. For imperial nuts, we usually take one side to break (i.e. cut two cuts on one side), and test the hardness in the middle of one side of the cut surface. For small nuts, we usually grind off 20-30 threads on the profile before testing the hardness.
As a type of wooden screw, drill tail wire has far surpassed other similar products in terms of structure, usage, and performance. When choosing drill tail wire, we should also pay attention to relevant knowledge of drill tail wire in a timely manner.
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