Main Categories Of Hexagonal Bolts

1. According to the force mode of the connection, there are ordinary ones and those with reamed holes. The bolts for reamed holes should match the size of the hole and be used when subjected to lateral force.
2. According to the shape of the head, there are hexagonal heads, round heads, square heads, countersunk heads, etc. Generally, countersunk heads are used in places where the surface is required to be smooth and without protrusions after connection, because the countersunk head can be screwed into the parts. The round head can also be screwed into the parts. The tightening force of the square head can be greater, but the size is large. The hexagonal head is the most commonly used.
In addition, in order to meet the needs of locking after installation, there are holes in the head and holes in the rod. These holes can prevent the bolts from loosening when vibrating.
Some bolts have bare rods without threads that need to be made thin, called thin waist bolts. This type of bolt is conducive to connections with variable forces.
There are special high-strength bolts on steel structures. The head will be larger and the size will also vary.
There are also special uses: T-slot bolts, which are most commonly used on machine tool fixtures. They have a special shape and the two sides of the head need to be cut off. Anchor bolts are used to connect and fix the machine to the ground. There are many shapes, such as U-shaped bolts, as mentioned above, etc. There are also special studs for welding, one end has threads and the other end does not, which can be welded on the parts and the nuts can be screwed directly on the other side.