Introduction And Classification Of Hexagon Bolts

Hexagon bolts are hexagon head bolts (partial thread) - grade C and hex head bolts (full thread) - grade C. Also known as hexagon head bolts (rough) hair hexagon head bolts, black iron screws.

Hexagon bolt: A type of fastener consisting of a head and a screw (a cylinder with an external thread), which needs to be matched with a nut to fasten and connect two parts with through holes.

This form of connection is called a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

Classification

1. According to the force mode of the connection, there are ordinary ones and those with reaming holes. The bolts used for reaming holes should be matched with the size of the holes and used when subjected to lateral force.

2. According to the shape of the head, there are hexagonal head, round head, square head, countersunk head, etc. Generally, the countersunk head is used in the place where the surface is smooth without protrusion after connection, because the countersunk head can be screwed into the part. The head can also be screwed into the part. The tightening force of the square head can be larger, but the size is large. The hex head is 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 can prevent the bolts from loosening when they are vibrated.

Some bolts without threads should be thinned, called thin-waisted bolts. This kind of bolt is conducive to the connection of variable forces.

There are special high-strength bolts on the steel structure. The head will be larger. The size will also change.

In addition, there are special uses: T-slot bolts, most used on machine tool fixtures, special shapes, and both sides of the head should be cut off. Anchor bolts are used for machine and ground connection and fixing, there are many shapes, U-shaped bolts , as mentioned above, etc.

There are also special studs for welding, one end has a thread and the other end is not, which can be welded on the part, and the other side can directly screw the nut.