Grade 5.6,9.8,10.9,12.9 bolts Staninless Steel Bolts M8 Sliver Color Light Blots A193 B7 Standard

Folding according to the shape of the head:

They have hexagonal heads, round heads, square heads, sunken heads and so on.Hexagonal heads are the most commonly used.Usually countersunk head is used to require connection
The rear surface is smooth without any bumps because the countersunk head can be screwed into the parts.The round head can also be screwed into the parts.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 the rod. These holes can prevent the bolts from loosening when they are subjected to vibration.
Some bolts do not have threaded rod to do fine, called fine waist bolt.This kind of bolt facilitates coupling under variable forces.
There are special high strength bolts on the steel structure. The head will be larger and the size will also change.
In addition, it has special use: T-shaped slot bolt, most used on the jig, special shape, both sides of the head should be cut off.The anchor bolts, used for attaching machines to the ground, come in many shapes.U-bolt, as described above.And so on.
There are special studs for welding, one end has a thread one end, can be welded on the parts, the other side directly screw the nut.