What Is The Function of Self-tapping screws?

Self-tapping screws are used for non-metallic or softer metals, without the need to punch the bottom hole and tap; Self-tapping screws are pointed, so as to "self-tapping"; Ordinary screws are flat headed, the same thickness. Self-tapping screw means that the hole is drilled without tapping the hole, the screw is different from the general, the head is pointed, the tooth distance is relatively large, and the chip free tap is a bit like, you can screw directly into the hole without tapping the teeth, metal and plastic are usually used this method. It can be consolidated on the material, relying on its own thread, the consolidated body will "attack - drill, squeeze, press" out of the corresponding thread, so that they are closely matched with each other.

Self-tapping locking screws are also mostly used for connections between thin metal plates. The thread is an ordinary thread with an arc-shaped triangular cross-section, and the thread surface also has high hardness. Therefore, when connecting, the screw can also tap the internal thread in the thread bottom hole of the connected piece to form a connection. This kind of screw is characterized by low screwing torque and high locking performance. It has better working performance than ordinary self-tapping screws and can be used instead of machine screws.

Wall panel self-tapping screws are used for the connection between gypsum wallboards, etc. and metal joists. The thread is a double-headed thread, and the thread surface also has high hardness (≥HRC53). It can be quickly screwed into the keel to form a connection without making prefabricated holes.

The difference between self-drilling and self-tapping screws and ordinary self-tapping screws is that ordinary self-tapping screws must go through two processes of drilling (drilling threaded bottom holes) and tapping (including fastening connections) when connecting; while self-drilling and self-tapping screws When screws are connected, the two processes of drilling and tapping are combined into one process. It first uses the drill bit in front of the screw to drill, and then uses the screw to tap (including fastening the connection), saving construction time and improving construction efficiency.

Pan head and?hexagonal head self-tapping screws?are suitable for situations where the drill bit is allowed to be exposed. Hexagonal head self-tapping screws can withstand a larger torque than pan head self-tapping screws. Countersunk head and hexalobular self-tapping screws are suitable for situations where the nail head is not allowed to be exposed. Hexalobular self-tapping screws can withstand greater torque than countersunk head self-tapping screws; semi-countersunk head self-tapping screws are suitable for situations where the nail head is allowed to be slightly exposed. occasion. When assembling and disassembling self-tapping screws, slotted self-tapping screws require a slotted screwdriver, cross-recessed self-tapping screws require a cross-shaped screwdriver, hexagon socket self-tapping screws require an Allen wrench, and hexagonal self-tapping screws. A dead wrench, ring wrench, socket wrench or adjustable wrench is required for tapping screws.