What are the general uses of high strength nuts

It is used in high strength nut pair, and the strength grade (after heat treatment) is grade 10, which is used with grade 10.9 bolts. The mechanical properties and calculation methods of ordinary bolts and high strength nuts are different. The force of high-strength nut is firstly applied with pre tension P in its interior, and then friction resistance is generated on the contact surface between the connected parts to bear external load, while ordinary bolt directly bears external load.        
Strength nut connection has the advantages of simple structure, good mechanical properties, detachable, anti fatigue, and not loose under dynamic load, which is a promising connection mode.
The high strength nut is tightened with special spanner, which makes the bolt produce huge controllable pre tightening force. The same preload is produced on the connection by means of nuts and backing plates. Under the action of pre pressure, there will be great friction along the surface of the connector. Obviously, as long as the axial force is less than this friction force, the member will not slide and the connection will not be damaged. This is the principle of high strength nut connection.
High strength nut connections prevent sliding by friction between contact surfaces. In order to make the contact surface have enough friction, it is necessary to increase the clamping force and the friction coefficient of the contact surface. The clamping force between members is achieved by applying pre tension to the bolt, so the bolt must be made of high strength steel, which is also called high strength bolt connection.

In high strength bolt connection, friction coefficient has great influence on bearing capacity. The results show that the friction coefficient is mainly affected by the contact surface form and the part material. In order to increase the friction coefficient of the contact surface, sandblasting and wire brush cleaning are often used to treat the contact surface of components within the connection range.
In fact, there are two types of high strength nuts: friction type and pressure type.
The criterion of shear force of friction type high strength bolt is that the shear force caused by design load does not exceed the friction force.
The design standard of high strength bolts under pressure is not to cut off the shaft or crush the plate. In addition, high strength bolts cannot be reused.
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