The self-tapping screw can be easily screwed into the dry wall during assembly. A hole is self-drilled in the steel thread and the matching female thread is tapped. The horn head has a concave bearing surface that will not damage the wallpaper or plaster when screwed in. Surface. Most self-tapping screws are for commercial purposes. For example, when self-tapping screws are provided as combination screws, they can provide a more compact service. Self-tapping screws, such as special design with thick and thin threads, should focus on the prevention after assembly loose.

Thread forming: It is directly developed from the iron screw. The thread forming self-tapping screw must be drilled in advance, and then the screw is screwed into the hole to forcefully squeeze out the female thread, and the original material on the female thread will be removed. Squeeze between the male threads, this is called thread forming self-tapping screw.

Thread cutting self-tapping screw: cut one or more cutting holes at the end of the thread, so that when screwing into the pre-drilled hole, the screw tail and teeth can be used to cut the matching female thread in a similar way to a screw tap. It can be used on thick plates, hard or fragile materials that are not easy to shape.

6 Thread rolling-triangular teeth self-tapping screw, also known as Type, is developed based on the principle of forming screw taps. Thread rolling self-tapping screws have specially designed threads and tail ends so that the screws can be self-tapping under intermittent pressure. Rolled into a matching female thread. At the same time, the material around the hole can more easily fill the space between the thread and the bottom of the self-tapping screw. Since its friction force is smaller than that of the thread-forming self-tapping screw, it can be used on thicker materials. The torque required for rotation is better controlled, and the combined strength is higher. The engineering standard definition of thread rolling into self-tapping screws is higher and clearer in terms of material, heat treatment, and strength than forming or cutting self-tapping screws. This makes the thread rolled into a self-tapping screw to become a real "structural" fastener.