Bulloni della testa contrastanti con collo quadrato

Countersunk head bolts with square neck is a kind of common round head bolts, our bolts adopt GB standard.Square neck countersunk head bolt is also called carriage bolts it can be divided into big head carriage bolts and small head carriage bolts according to its head size.

The difference with hexagonal bolts

Shape characteristics

The head of countersunk head bolts with square neck is usually half-round or half-round, and the screw part has a square neck structure near the head, which is a typical feature that distinguishes it from other bolts.

The head of hexagonal bolts is positive hexagonal, which is easy to use wrenches and other tools for tightening and loosening operations, and the screw is cylindrical with no square neck structure.

Anti-rotation performance

The square neck part of countersunk head bolts with square neck cooperates with the square hole on the connected part, when the nut is tightened, the bolt will not follow the nut to rotate together, which can effectively prevent the bolt from rotating relative to the connected part, especially suitable for occasions that require good anti-rotation performance.

Hexagonal bolt have no direct anti-rotation structure in itself, it only relies on the friction between the bolt and the nut as well as the coordination between the bolt and the connected parts to prevent rotation. In some occasions with high vibration or high requirements for anti-rotation, additional anti-loosening measures may be required, such as the use of spring washers, anti-loosening nuts and so on.

Advantages

Countersunk head bolts with square neck are commonly used in parts that require reliable anti-rotation connections, such as the connection of railroad tracks, some of the building structure to withstand large shear and tensile forces and require that the bolt can not be rotated nodes.

Countersunk head bolts with square neck are used in a wide range of applications such as the connection of certain agricultural and mining machinery.