Characteristics and uses high-strength bolts bolts connecting with simple construction, good mechanical properties affected, removable, anti-fatigue, and will not loosen under dynamic loads, etc. is connected promising approach is to use high-strength bolts special wrench tighten the nut on the bolt pretension huge but controlled by the nut and plate, connected pieces of the same size are also produced in the pre-pre-pressure pressure along the surface will have to be connected Larger friction, obviously as long as the axial force is less than this will not slip friction member, which connection is not compromised principle of high strength bolts connecting member is frictionally connected to the contact surface between the prevent their mutual slip of the contact surface has sufficient friction must increase the clamping force members and the friction coefficient increases clamping force component component is the contact surface between the bolt by applying a pre-tension bolts to achieve it must be made of high strength steel, which is called the reason of high strength bolts connecting, the impact of the size of the coefficient of friction of the bearing capacity of the large trials show that the friction coefficient is mainly affected by material contact surface forms and structures In order to increase the impact of the construction of the contact surface friction coefficient is often used to be sandblasted, with a wire brush to clean up other methods of contact surfaces within range components for processing high-strength bolts are actually two kinds of friction-and friction-type high pressure withstand shear shear design load criteria is less than the friction caused by the pressure-type high shear is based on the shaft is not bad or plates are not crushed as design criteria