What is the classification of hexagonal bolts?
1. According to the force-bearing mode of the connection, there are ordinary and reamed. Reaming bolts should match the size of the hole and be used when subjected to lateral forces.
2. According to the shape of the head, there are the hexagonal head, round head, square head, countersunk head, etc. The countersunk head is generally used in places where the surface is smooth and does not need to protrude after connection, because the countersunk head can be screwed into the part. The round head can also be screwed into the part. The tightening force of the square head can be larger, but the size is large. Hex heads are 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 prevent the bolt from loosening when subjected to vibration.
Some bolts without threads are made thinner, called thin-waist bolts. This type of bolt facilitates variable force connections.
There are special high-strength bolts on the steel structure. The head will be bigger. Dimensions also change.
In addition, there are special purposes: T-slot bolts, which are mostly used on machine tool fixtures, have special shapes, and both sides of the head must be cut off. Anchor bolts are used to connect and fix machines and the ground, and come in many shapes, such as the U-shaped bolts mentioned above.
There are also special studs for welding, one end is threaded and the other end is not, which can be welded on the part, and the other end is directly screwed with the nut.