What are the characteristics of the appearance of roof bolts?  Next, Zhejiang Weigao Bolt Factory will introduce you in detail:
1. According to the stress mode of connection, there are common bolts and bolts for reaming holes. Bolts for reaming holes shall be matched with the size of holes and used when subjected to transverse force.
2, according to the shape of the head has a hexagonal head, round head, square head, countersunk head, etc. Generally countersunk head is used in the place where smooth surface is not protruding after connection, because the countersunk head can be screwed into the parts.

In addition, in order to meet the need of locking after installation, there are holes in the head and in the rod, which can prevent the bolts from loosening when subjected to vibration.
Some China Nut need to be made into thin smooth rods without threads, which are called thin waist bolts. These bolts are beneficial to the connection under variable forces.
There are special high-strength bolts on the steel structure. The head will be bigger. The size will also change.

In addition, there are special uses: T-groove bolts are used most frequently on machine tools and jigs, with special shapes. Both sides of the head must be cut off. Anchor bolts are used for connecting and fixing machines and the ground, and there are many shapes. U-shaped bolts, as mentioned above. etc.

There is also a special stud for welding, one end of which is threaded and the other end is not, which can be welded to the part while the other end is directly screwed with the nut.