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The Classification Of Bolts
Mar 25, 2018

According to the mode of the connection: the ordinary and the hinged hole. Shape of head: hexagon head, round head, square head, heavy head, etc. The hexagonal head is the most commonly used. Usually the sink is used where the connection is required.

U-bolt English name for U - bolt, are standard parts, the shape of U so also known as U bolt, two head thread can be combined with nuts, mainly used in the fixed tube such as pipes or flake content such as automobile plate spring, because of the way its fixed objects, like a person is riding a horse is called u-bolt. The thread length is divided into full and non-full thread.

According to the thread, the teeth are divided into coarse teeth and fine teeth, and the coarse teeth are not displayed in the sign of bolts. Bolt according to the performance into 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, 12.9, eight grades, of which more than 8.8 (8.8) bolt is made of low carbon alloy steel and medium carbon steel and the heat treatment (quenching + tempering), known as the high strength bolt, 8.8 the following (not including 8.8) known as ordinary bolts.

The ordinary bolts can be divided into three grades: A, B and C according to the production accuracy, A and B are the refined bolts, and the C grades are rough bolts. For steel structure with connection bolts, except for special mention, generally for ordinary crude c-grade bolts. Differences between different classes of machining method, usually corresponding processing method is as follows: (1) A and B level bolt of pole composed of lathe processing, surface smooth, precise size, their level of material properties with A magnitude of 8.8, manufacture installation is complex, the price is higher, rarely used; The grade C bolt is made of unmachined round steel, the size is not accurate enough, its material performance level is 4.6 or 4.8. When the shear connection is large, it is easy to install and low production cost. It is used for the temporary fixation of the tension connection or installation.