使用于高强度螺母副中,强度等级(热处理后)为10级,配合10.9级螺栓使用。普通螺栓与高强度螺母的受力性能与计算方法均有所区别的。高强度螺母的受力是通过在其内部施加预拉力P,然后在被连接件之间的接触面上产生摩擦阻力来承受外荷载的,而普通螺栓则是直接承受外荷载的。

Used in high-strength nut pair, the strength grade (after heat treatment) is grade 10, 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 to bear the external load by applying the pretension P inside the nut, and then generating the friction resistance on the contact surface between the connected parts, while the ordinary bolt bears the external load directly.

强度螺母连接具有结构简单、机械性能好、可拆卸、抗疲劳、动荷载下不松动等优点，是一种很有前途的连接方式。高强度螺母用专用扳手拧紧，使螺栓产生巨大的可控预紧力。通过螺母和垫板，在连接件上产生相同的预压力。在预压力的作用下，沿连接件表面会产生很大的摩擦力。显然，只要轴向力小于这个摩擦力，构件就不会滑动，连接也不会损坏。这就是高强度螺母连接的原理。

The strength nut connection has the advantages of simple structure, good mechanical properties, detachable, anti fatigue, no loosening under dynamic load and so on. High strength nuts are tightened with special spanner to produce huge controllable preload. Through the nut and the backing plate, the same preload is generated on the connector. Under the action of preload, there will be a lot of friction along the surface of the connector. Obviously, as long as the axial force is less than this friction, the component will not slide and the connection will not be damaged. This is the principle of high strength nut connection.

高强度螺母连接通过接触面之间的摩擦来防止滑动。为了使接触面具有足够的摩擦力，必须提高夹紧力，增加接触面的摩擦系数。构件之间的夹紧力是通过对螺栓施加预张力来实现的，因此螺栓必须由高强度钢制成，这也称为高强度螺栓连接。

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 realized by pre tension on bolts, so bolts must be made of high strength steel, which is also called high strength bolt connection.

在高强度螺栓连接中，摩擦系数对承载力影响很大。试验表明，摩擦系数主要受接触面形式和零件材料的影响。为了增加接触面的摩擦系数，经常使用喷砂和钢丝刷清洁来处理连接范围内的部件的接触面。事实上，高强度螺母有两种类型：摩擦型和压力型。

In high strength bolted connections, the friction coefficient has a great influence on the bearing capacity. The results show that the friction coefficient is mainly affected by the form of contact surface and the material of parts. In order to increase the friction coefficient of the contact surface, sandblasting and wire brush cleaning are often used to clean the contact surface of the parts within the connection range. In fact, there are two types of high strength nuts: friction type and pressure type.

摩擦型高强度螺栓承受剪力的准则是设计载荷引起的剪力不超过摩擦力。

The shear force criterion of friction type high strength bolt is that the shear force caused by design load does not exceed the friction force.

承压高强度螺栓的设计标准是不切断轴或不压碎板。此外，高强度螺栓不能重复使用。

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.