1.According to the connection force method, there are o […]
1.According to the connection force method, there are ordinary and hinged holes. Bolts for hinged holes must match the size of the hole and are 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 where the surface after the connection is smooth without protrusions, because the countersunk head can be screwed into the part. The head can also be screwed into the part. The tightening force of the square head can be larger, but the size is large. Hex head is the most commonly used.
In addition, in order to meet the need for locking after installation, there are holes in the head and holes in the rod.These holes can prevent the bolt from loosening when subjected to vibration.
Some high-strength bolts and nuts without threads need to be thin, called thin waist bolts. Such bolts are conducive to the connection of variable forces.
There are special high-strength bolts on the steel structure. The head will be larger. The size will also change.
In addition, there are special uses: T-slot bolts, the most commonly used on machine tool fixtures, special shapes, cut off both sides of the head. Anchor bolts are used to connect and fix the machine and the ground, there are many shapes. U-bolts As before. Etc.
There are also special studs for welding.One end has a thread and one end is not.It can be welded to the part and the other side is directly screwed.