What is the thread of the tapping screw?
When assembled, self-tapping screws can be easily screwed into the drywall by drilling a hole in the steel teeth and tapping the matching female thread. Its horn head has a recessed bearing surface that prevents damage to wallpaper or plaster when screwed in. Self-tapping screws are mostly commercial, such as combination screws to provide self-tapping screws, can provide tighter service. But if the tapping screw has a special design of thick and fine threads, it is for the locking after assembly.
Thread forming: directly from the metal screw development. To use a threaded forming self-tapping screw, you need to drill a hole, then screw into the hole, and squeeze hard to match the female thread. The raw material on the female thread will be squeezed between the male thread. This is called a threaded forming self-tapping screw. It can only be applied to thin and malleable materials, so it was developed.
Cutting threaded self-tapping screws: Cutting one or more notches at the end of the thread so that when screwed into the pre-drilled hole, the tail and teeth of the screw can be used to cut the matching internal thread in a similar tapping manner. Can be used for thick plate, hard or fragile materials.
Thread rolling – Triangle thread tapping screw, also known as type, is based on the forming thread tapping principle. Threads that roll into self-tapping screws have specially designed threads and tail ends that allow the screw to roll into a matching internal thread at intermittent pressure. At the same time, the material around the hole can more easily fill the space between the thread of the self-tapping screw and the root of the thread. Because it has less friction than the threads that form self-tapping screws, it can be used on thicker materials and the torque required for rotation can be better controlled. Higher strength after combination. The engineering standard definition of screw-rolling into tapping screws is higher and clearer in terms of material, heat treatment, strength, etc. than molding or cutting into tapping screws, which makes screw-rolling into tapping screws a true structural fastener.