Special Type Socket Head Cap Screw (Star Type)

      Huizhou Screw FactoryThe family thinks that screws are universal, and there is a difference between screws and screws. Screws are generally called wood screws; they are the kind with sharp front ends and large pitches, which are generally used to fasten wooden and plastic parts. The screw is a machine screw (machine screw) with a flat head at the front end and a small and uniform pitch. It is generally used to fasten metal and machine parts.

Huizhou screw manufacturers believe that in the Middle Ages, carpenters used wooden nails or metal nails to connect furniture to wooden structures. In the 16th century, manicurists began to produce nails with spirals so that things could be connected more firmly. This is a small step from such a nail to a screw.

Around AD 1550, metal nuts and bolts appeared in Europe as fasteners, all of which were handmade on crude wooden lathe.

Huizhou screw manufacturers believe that screwdrivers (screwdrivers) appeared in London around 1780. Carpenters found that tightening screws with a screwdriver can fix things better than hammering with a hammer, especially when encountering fine-grained screws.

In 1797, Maudesley invented the all-metal spiral lathe in London. Wilkinson built a nut and bolt making machine in the United States. Both machines can produce universal nuts and bolts. Screws were very popular as fixing parts because a cheap method of production was found at that time.

In 1836, Henry Philips applied for a patent for a cross-recessed nail head screw, marking a major advancement in screw base technology. Unlike conventional groove head screws, the edges of the groove head screws are different. This design makes the screwdriver automatically centered and not easy to slip off, which is very popular. Universal nuts and bolts can connect metal parts together. Thus, in the 19th century, metal bolts and nuts could be used by manufacturing machines to build houses instead of wood.

Huizhou screw manufacturers believe that at present, the main function of screws is to fasten two workpieces together. Screws are used in general equipment, such as mobile phones, computers, automobiles, bicycles, various machine tools, and almost all machines use screws. Screws are small screws used in industrial products that are indispensable in daily life, such as cameras, glasses, clocks, electronics, etc. General screws for TV sets, electrical appliances, musical instruments, furniture, etc.

Huizhou screw factory think screw application:

1. First remove the sludge on the surface of the broken screw head, and then use the section to mold. Then, with an electric drill, install a drill bit with a diameter of 6-8mm, in the cross section of the drilled hole. Cup head screw manufacturers think it is necessary to pay attention to the need to drill through these holes. After the hole is drilled, remove the small drill bit, replace it with a drill bit with a diameter of 16mm, and continue to expand the hole through the broken bolt.

2. Take a welding rod with a diameter of less than 3.2mm, and weld the broken bolt in the drill hole from inside to outside with small and medium current. Take only half of the total length of the broken bolt.Cup Head ScrewThe manufacturer thinks not to start welding too long, so as not to burn through the outer wall of the broken bolt. After welding to the upper end surface of the broken bolt, continue to weld a cylinder with a diameter of 14-16mm and a height of 8-10mm.

3. After surfacing, hit the end face with a hammer to make the broken bolt vibrate along its axial direction. Cup head screw manufacturers believe that due to the heat generated by the previous arc and subsequent cooling, coupled with the vibration at this time, the broken bolts will loosen with the threads of the body.

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