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Generally, the countersunk head is used where the surface is required to be smooth without protrusion after connection, because the countersunk head can be screwed into the parts. 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. 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 bolt from loosening when it is vibrated. Some bolts without thread should be made thin, which is called thin waist bolt. This kind of bolt is conducive to the connection under variable force. There are special high-strength bolts on the steel structure. The head will be larger and the size will change. T-shaped clamps are used for cutting off bolts on both sides of the machine. In addition, T-shaped clamps are most useful for cutting off bolts on both sides of the machine. Anchor bolts, which are used to connect and fix the machine and the ground, have many shapes. U-bolt, as mentioned above. wait. There are also special studs for welding. One end is threaded and the other end is not. They can be welded on the parts and directly screw the nuts on the other side.