U-shaped bolts are non-standard parts that are usually used to fix tubes such as water pipes or sheet springs such as automobile leaf springs. Because of its U-shaped shape, it can be combined with nuts, so it is also known as U-shaped bolts or riding bolts.
The main shapes of U-shaped bolts include semicircle, square right angle, triangle, oblique triangle and so on. U-shaped bolts with different material characteristics, length, diameter and strength grades can be selected according to different use environments and requirements.
He has a wide range of uses, mainly used in construction and installation, mechanical parts connection, vehicles and ships, bridges, tunnels, railways and other fields. On trucks, U-bolts are used to stabilize the car site and frame. For example, the leaf spring is connected by U-shaped bolts.
Bolt grade selection.
Bolt grades are usually divided into two types: high strength bolts and ordinary bolts. When selecting the bolt grade, it needs to be considered according to the application environment, force characteristics, raw materials and so on.
1. From the perspective of raw materials: high-strength bolts are made of high-strength materials, such as 45 # steel, 40 boron steel, 20 manganese titanium boron steel. Ordinary bolts are usually made of Q235 steel.
two。. In terms of strength grade, the commonly used high strength bolts are 8.8s and 10.9s, of which 10.9S is the most widely used. The strength grades of ordinary bolts are 4.4, 4.8, 5.6 and 8.8.
3. From the point of view of the mechanical characteristics: high-strength bolts apply pre-tension and transfer external force by friction. On the other hand, the ordinary bolt connection depends on the shear resistance of the bolt rod and the pressure on the hole wall to transfer the shear force, and the pre-tension is very small when tightening the nut. Therefore, the mechanical characteristics need to be considered in the application.
4. From the point of view of use: the bolted connection of the main components of the building structure is generally connected by high-strength bolts. Ordinary bolts can be reused, while high-strength bolts can not be reused and are generally used for permanent connection.
In a word, when selecting the specification and bolt grade of U-shaped bolt, we should consider the material, strength grade and stress characteristics of the bolt according to the actual demand and use environment, and select the suitable product to achieve the effect of safety, stability and reliability.