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Haiyan Tianqi Fastener Co., Ltd.
  • Add:Jiaxing Haiyan China NO.1-3 Jincheng South road, Qinshan Industrial Zone of Haiyan, Jiaxing
  • Tel:+86-573-86408971
  • Mobile Phone:+86-13606831322
  • Fax:+86-86408973
  • E-mail:tianqi@din571.com
  • Post Code:314300
  • Skype:tianqi

The Three Category of Screw


Categories include normal screws, self-tapping screws and expansion screws. Cap screw used in the past limited to full teeth fasteners, but this is not the standard usage. Hexhex screw Hex bolt As its name implies hexagonal head of the male fastener, designed to use the wrench rotation. The ASME B18.2.1 hex head screw is suitable for mounting on all hex bolts as per ASME B18.2.1, with a smaller head height and bar length tolerance than a typical Hex cap screw Place, but also contains the big hex bolts can not be used too much.

Socket cap screw, also known as an Allen bolt, is a screw with a hexagonal hole in the head and can be inserted into the hole with a hex key tighten or loosen. The most commonly used socket head cap screws are the cylindrical head screws, which are about 1.5 times the major diameter of the threads. Other heads include the Bottom head cap screw, which is aesthetically pleasing. Counterbored design allows the screw head does not need to be exposed on the surface of the object can be fixed can also be rotated, it is mostly used in the surface smaller, the traditional wrench inconvenient place to use.

Machine screw is generally less than the diameter of the screw, usually the whole tooth and the screwdriver rotation, such as slot, cross or hexagon and so on. As for the engineering, construction and bridges Use large screws, nuts; traffic equipment, aircraft, trams, cars and other size screws are used. Screws have an important industrial task, and as long as there is industry on earth, the function of screws is always important.

Types of screws, whether it is a small screw for eyeglasses or large-scale heavy engineering with a large number of large screws, the main purpose of the use of industrial products in the composition of a fixed height, often occur in the use of teeth and teeth can not be intimacy , Too hard to lock the screw head off, or bad tooth tight lock is not tight and so failed to meet the conditions of use, are the quality of the accuracy of the problem. Screw is a "product", not a handmade artwork, in mass production, in order to achieve high precision and stability of the quality and popular price for the purpose of supply to consumers.





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