American ASTM SA193-B7 high-strength screw 

High strength screw connections have the advantages of simple construction, good stress performance, detachable replacement, fatigue resistance, and non loosening under dynamic loads, making them a promising connection method.B7 High-strength Screw,SA193-B7 High-strength Screw,ASTM High-strength Screw High strength screws use a specially designed wrench to tighten the nut, causing a huge and controlled pre tension on the screw. Through the nut and backing plate, a pre pressure of the same size is also generated on the connected parts. 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 screw connection. High strength screw connections rely on the friction between the contact surfaces of the connecting components to prevent their mu…