1. Screws: It is also a type of fasteners composed of two parts, a head and a screw, which can be divided into three categories according to the purpose-machine screws, set screws and special purpose screws. The machine screw is mainly used for the fastening connection between a part with an interna... read more
After driving the self-drilling and self-tapping screw into the hole on the ground or wall, use a wrench to tighten the nut on the self-drilling and self-tapping screw. The screw goes out, but the outer metal sleeve does not move, so the big end under the screw is Expand the metal sleeve so that it ... read more
As we all know, there are many main factors that affect the carburizing process of locking self-tapping screws, such as temperature and time. When the screw material, carburizing temperature and carbon potential are determined, the carburizing time will be determined according to the depth of the ca... read more
(l) Take measures from the sharpening of the drill bit to overcome the phenomenon of drilling deviation. To shorten the chisel edge, make the edge shape of the drill well centered, and form a turning point on the main cutting edge, which is conducive to chip separation and chip breaking. Increase th... read more
In the process of screwing the screw into the prefabricated hole of the connected part (drilling, punching a shell or die-casting smooth hole), the screw thread is extruded to form an internal thread in the prefabricated hole , To achieve the purpose of connection and fastening. The structure of sel... read more
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