Rod end stud are used for normal and reamed holes according to the way they are connected. The bolts for reaming holes should be matched with the size of the holes. When used for lateral forces, the head shape has hexagons. Head, round head, square head, countersunk head, etc. The general countersunk head is used in places where the surface is required to be smooth and not protruding, 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 very large. Hex heads are often used.
In order to meet the needs of post-installation locking, the hexagonal bolts have holes in the head and holes in the rods. These holes can prevent the bolts from being loosened when they are vibrated. Some bolts with unthreaded rods are to be thin, called thin waist bolts. These bolts are beneficial for the coupling of variable forces.
There are special high-strength bolts on the hexagonal bolt steel structure. The head will be larger and the size will vary. In addition, there are special uses: T-slot bolts, used on machine tool fixtures, special shape, cut off on both sides of the head. Anchor bolts are used for fixing the machine and the ground. There are many shapes, U shape Bolts, etc.
There is also a special stud for welding. One end has a thread and one end is not welded. It can be welded to the part and the other side can be directly screwed.