Today we will talk about high-strength nuts. First, let us talk about what high-strength nuts are? Definition: High-strength nuts are a kind of standard parts. The size of the general nut is much larger. The shape and connection structure of high-strength nuts are basically the same as those of ordinary nuts. The key difference between the two standard parts is that ordinary nuts transmit shear stress by means of the rod body under pressure and its bending resistance. The tension formed by the nut is in the The time for tightening the nut is small, so there is no need to consider the damage it will cause; the principle of connecting a high-strength nut is to deliberately add a large pre-tension force to the nut, so that the middle of the connected surface is squeezed, so the vertical There will be a very large friction force directly in the direction of the screw rod, and the shear stress is transmitted by means of this friction force. The pre-tensioning force of high-strength nuts is achieved by tightening the nut cap, while ordinary high-strength nuts generally use the torque method and corner method, and the torsion-shear type high-strength nuts use the end of the nut to control the pre-tensioning force. The high-strength nuts used by Maijin are mainly used in the construction of steel structures. A very important feature of high-strength nuts is that they are limited to one use, usually all connected, and cannot be reused many times. Classification: Classification according to its bearing capacity can be divided into extrusion type and pressure-bearing type: the difference of this classification method is that there is a difference in the calculation method, and the nuts of the pressure-bearing type roll between the plates as normal In the limit case of the application, the friction coefficient of the nut rolling between the plates is used as the limit case of the bearing capacity. For the application in real life, friction coefficient should be used for the very critical structure or the structure bearing the power bearing capacity, and the pressure-bearing nut connection can be used in other places to reduce the cost.