What are the classifications of hot-dip galvanized bolts from Chinese fasteners factory? Bolts: mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (cylinder with external thread), which needs to be matched with a nut to fasten and connect two parts with through holes.

　　 According to the force mode of the connection, it is divided into ordinary and reamed hole. According to the shape of the head: there are hexagonal head, round head, square head, countersunk head and so on. Among them, the hexagonal head is the most commonly used. The countersunk head is generally used where connection is required.

The English name of the riding bolt is U-bolt, which is a non-standard part. The shape is U-shaped, so it is also called U-bolt. There are threads on both ends that can be combined with a nut. It is mainly used to fix tubular objects such as water pipes or sheet objects such as car plates. The spring is called a riding bolt because it fixes the object in the same way as a person riding on a horse. According to the thread length, it is divided into two types: full thread and non-full thread.

　　According to the thread type, it is divided into two types: coarse thread and fine thread. The coarse thread type is not displayed in the bolt mark. Bolts are divided into eight grades: 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9, 12.9 according to their performance grades. Among them, bolts of grade 8.8 and above (including grade 8.8) are made of low-carbon alloy steel or medium-carbon steel and are heat treated (quenched). + Tempering), generally referred to as high-strength bolts, generally referred to as ordinary bolts below grade 8.8 (excluding grade 8.8).

　　 Ordinary bolts can be divided into three grades: A, B, and C according to the manufacturing accuracy. A and B grades are refined bolts, and C grade is rough bolts. For connecting bolts for steel structures, unless otherwise specified, they are generally ordinary crude grade C bolts. The processing methods of different grades are different, and the corresponding processing methods are usually as follows: ①The bolts of grade A and B bolts are processed by lathes, with smooth surface and precise size. The material performance grade is 8.8, the production and installation are complicated, and the price is relatively high. High, rarely used; ②C-level bolts are made of unprocessed round steel, and the size is not accurate enough, and the material performance level is 4.6 or 4.8. Industrial Full Threaded Stud Manufacturer has large deformation during shear connection, but it is easy to install and low in production cost. It is mostly used for tensile connection or temporary fixation during installation.