Bolt manufacturers introduce you to the classification of bolts

According to the bearing capacity of the connection, the bolt manufacturers can be divided into general ones and those with reaming holes. According to the shape of the head: there are hexagonal head, square mouth, square head, and countersunk head. Among them, the hex head is the most common. Generally, the countersunk head is used in the area where connection is required. The English name of the riding bolt is U-bolt. It is a non-standard part. The shape is U-shaped, so it is also called a U-bolt. There are threads on both sides that can be combined with the nut. It is mainly used to fix tubular substances such as water pipes or small Block thing is like the leaf spring of car, because the way that it fixes object is like a person riding on a horse, so it is called riding bolt. According to the thread length, it is divided into two types: full thread and part-time thread. Bolt manufacturers are divided into two types: coarse thread and fine thread according to the thread of the thread, and the coarse thread cannot be displayed in the logo of the bolt. Bolts are divided into eight grades according to their performance grades: 3.6.4.8.5.6.6.8.8.8.9.8.10.9.12.9. Among them, the raw materials of bolts above grade 8.8 (including grade 8.8) are green alloy steel or high carbon steel and have been heat treated. (heat treatment process + heat treatment), commonly known as high wear-resistant bolts, below grade 8.8 (no grade 8.8) commonly known as general bolts. General bolts can be divided into three grades of A.B.C according to the manufacturing accuracy, A.B grade is specially made bolts, and C grade is made of random bolts. As for the connecting bolts used in the steel frame, unless they are specially marked, they are generally ordinary C-grade bolts. There are differences in the production and processing methods of different grades of bolt manufacturers. Generally, the production methods are as follows: ①The bolts of A and B grade bolts are processed by CNC lathes, with smooth surfaces, accurate specifications and grades, and their material performance grades It is grade 8.8, the production and installation are complicated, the price is high, and it is rarely used; ② Grade C bolts are made of unprocessed round steel, the specifications and models are not accurate enough, and the performance grade of the raw materials is grade 4.6 or 4.8. The deformation is large when the bending strength is connected, but the installation is convenient and quick, and the production and processing costs are low. It is mostly used for tensile strength connection or temporary fixation during installation.