Usage of high-strength bolts

Usage of high-strength bolts

Used in high-strength bolt pairs, with a strength grade (after heat treatment) of 10.9, used in conjunction with grade 10 nuts.

There are differences in the mechanical properties and calculation methods between ordinary bolts and high-strength bolts. The force of high-strength bolts is first borne by applying a pre tension force P inside them, and then generating frictional resistance on the contact surface between the connected parts to withstand external loads, while ordinary bolts directly bear external loads.

High strength bolt connection has the advantages of simple construction, good stress performance, detachable replacement, fatigue resistance, and non loosening under dynamic loads, making it a promising connection method.

High strength bolts use a special wrench to tighten the nut, causing the bolt to generate a huge and controlled pre tension. Through the nut and pad, the connected parts are also subjected to the same amount of pre pressure. Under the action of preload, a large frictional force will be generated along the surface of the connected component. Obviously, as long as the axial force is less than this frictional force, the component will not slip and the connection will not be damaged. This is the principle of high-strength bolt connection.

High strength bolt connections rely on the friction between the contact surfaces of the connecting components to prevent their mutual sliding. In order to have sufficient friction on the contact surfaces, it is necessary to increase the clamping force of the components and increase the friction coefficient of the contact surfaces of the components. The clamping force between components is achieved by applying pre tension to the bolts, so the bolts must be made of high-strength steel, which is why they are called high-strength bolt connections.

In high-strength bolted connections, the size of the friction coefficient has a significant impact on the bearing capacity. The experiment shows that the friction coefficient is mainly affected by the form of the contact surface and the material of the component. In order to increase the friction coefficient of the contact surface, construction often uses methods such as sandblasting and wire brushing to treat the contact surface of components within the connection range.

High strength bolts, also known as coarse thread screws, threaded screws, and full thread screws, are T-shaped shaped shaped buckles. Mainly used for mechanical equipment and construction. It is a type of through wall bolt, also known as high-strength through wall bolt, which plays a fastening role in machinery and also plays a role in controlling templates and preventing mold bursts in construction, just like through wall screws.

High strength bolts are used in machinery with varying specifications and vary depending on the strength required by the mechanical equipment. Usually, high strength bolts used in machinery require customized nuts, and the height of the nuts has strong requirements. The higher the nut height, the better the tightening effect.

Follow Ningbo Shengdu Fastener Technology Co., Ltd. to learn more about fastener products!