Self-tapping 

The countersunk head self-tapping includes a conical head design, self-tapping functional threads, and high material hardness. Unlike ordinary screws, it does not require pre-tapping of the internal thread. Instead, it directly relies on its own hardness to "cut" or "squeeze" the corresponding internal threads on the connecting material, thereby achieving a tight connection. This feature makes it particularly suitable for application scenarios such as thin plate connection and rapid assembly. The recessed design ensures that the installed machine head is fully submerged in the material surface without protruding to cause obstacles or affect the appearance. This feature is particularly important in fields such as furniture manufacturing and electronic product assembly.