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According to the force of the connection: divided into ordinary and reaming holes used. According to the shape of the head: there are six corners of the head, round head, square head, countersunk head, and so on. The hexagonal head is the most commonly used. The general countersunk head is used where the connection is required.
Riding Bolt English name is U-Bolt, is a non-standard standard, the shape is U-shaped so also known as U-shaped bolts, two threads can be combined with the nut, mainly used for fixing tubular objects such as water pipes or sheet-shaped objects such as car leaf spring, because of its fixed objects in the same way as people ride at the same moment, it is called The thread length is divided into two types: full thread and non full thread.
The tooth type of the thread is divided into coarse and fine teeth, and the coarse tooth type is not shown in the sign of the bolt. Bolts according to performance grade is divided into 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, 12.9 Eight grades, of which 8.8 level above (including 8.8) bolts material for low carbon alloy steel or medium carbon and by heat treatment (quenching + tempering), commonly known as high-strength bolts, 8.8 levels below ( Not including level 8.8) is commonly known as general bolts.
General bolts in accordance with the production accuracy can be divided into a, B, c three grades, A, B grade for the refining bolts, C-class for rough bolts. For steel structure connection bolts, except special note, generally coarse C-class bolts. There are differences in the methods of processing different grades, usually the corresponding processing is as follows: ①a, B-Class bolts by the lathe processing, smooth surface, accurate size, the material performance level of 8.8, the production and installation of complex, high prices, rarely used; ②c-level bolts made of raw round steel, the size is not accurate, Its material performance rating is level 4.6 or 4.8. Shear connection when the deformation is large, but easy to install, low production costs, more for the tensile connection or installation of temporary fixed.