Bolts and other fasteners some points A B C grade is what mean?
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Time：2020/3/19 14:01:21
Fasteners such as bolts A B C class refers to the manufacturing accuracy class of bolts.
According to the manufacturing accuracy, ordinary bolts can be divided into three grades: A, B and C. For steel structure connection bolts, unless otherwise specified, are generally plain coarse grade C bolts.
The bolt bars of grade A and B bolts are machined by lathes, with smooth surface and accurate size. The material performance grade is 8.8. The production and installation are complicated, and the price is high.
Grade C bolts are made of raw round steel and are not precise in size. Shear connection deformation, but easy to install, low production cost, most used for tensile connection or installation of temporary fixation.
Extended information:
Bolts according to the thread of the tooth type is divided into coarse teeth and fine teeth, coarse teeth type is not shown in the logo of the bolt.
According to the performance grade, the bolts are divided into 8 grades: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9, among which the bolts of grade 8.8 and above (including 8.8) are made of low-carbon alloy steel or medium carbon steel with heat treatment (quenching and tempering). They are generally referred to as high-strength bolts, and those of grade 8.8 and below (excluding 8.8) are generally referred to as ordinary bolts
Bolts in daily life and industrial production and manufacturing, is indispensable, bolts are also known as the industrial rice. It can be seen that bolts are widely used.
Bolt application scope: electronic products, mechanical products, digital products, electrical equipment, mechanical and electrical products. Bolts are also used in ships, vehicles, water conservancy projects, and even in chemical experiments. Anyway, a lot of places are useful to bolt. Precision bolts used on special digital products.
Miniature bolts for DVD, camera, glasses, clock, electronics, etc. General bolts for TV sets, electrical products, Musical Instruments, furniture, etc. Large bolts and nuts are used in engineering, construction and Bridges. Traffic equipment, aircraft, tram, car, etc., are the size of the bolt.
Bolts have important tasks in industry, as long as there is industry on earth, the function of bolts will always be important.
