Self-tapping screws are often seen in metal plates with relatively thin links (steel plates, saw plates, etc.). Due to the high strength of the threaded surface of the self-tapping screw (≥HRC45), when linking, the self-tapping screw is screwed into the connector that has been made with the threaded bottom hole in advance, so that the inner thread can be tapped in the threaded bottom hole of the link The thread thus completes the connection. There is a special screw that has better working performance than ordinary self-tapping screws and can even replace machine screws-self-tapping pin screws are often used for links between thin metal plates. The difference between it and the ordinary self-tapping screw is the ordinary thread with the arc-shaped triangular interface with higher hardness. This kind of excellent screw with low screwing torque and high locking performance, of course, can also tap the internal thread in the threaded bottom hole to be connected like a normal screw. The wa...