The main classification of bolts
According to the force of the connection points
Ordinary and hinged holes. Ordinary main bearing axial force, can also carry the requirements of the lateral force is not high. The bolts for the hinges are used in conjunction with the dimensions of the holes for use in transverse forces.
According to the shape of the head points
There are hexagonal head, round head, square head, countersunk head and so on. Which hexagonal head is the most commonly used. The general countersunk head is used to require a connection
After the surface is not smooth where the protrusion, because the countersunk head can be screwed into the parts. The round head can also be screwed into the part. The head of the tightening force can be larger, but the size is very large.
In addition, in order to meet the needs of the lock after installation, there are holes with holes, the rod has holes, these holes can make the bolt by vibration when not loose.
Some of the bolts do not thread the light pole to do fine, called the thin waist bolts. This bolt is conducive to the connection by the force.
Steel structure with a dedicated high-strength bolts, the head will be bigger, the size has changed.
Also special use: T-shaped slot bolts, the machine fixture with the most, the shape of special, both sides of the head to cut off. Anchor bolts, for machine and ground connection fixed, there are many kinds of shapes. U-bolts, as previously described. and many more.
There are special studs for welding, one with a thread, which can be welded to the part and the other side is directly screwed.
Riding bolts English name for the U-bolt, non-standard parts, the shape of the U-shaped so-called U-bolts, both ends of the thread can be combined with the nut, mainly for fixed pipe such as water pipes or flakes such as car plate Spring, because of its fixed objects like the way people riding in the same, so called riding bolts.