Threaded connection is a widely used detachable fixed connection, has the advantages of simple structure, reliable connection, convenient assembly and disassembly, widely used in mechanical equipment. One, double bolt assembly

Refers to the part between the connecting piece and the nut. A flat metal ring used to protect the surface of the connector from chafing by the nut and to disperse the pressure of the nut on the connector.Washer is divided into: flat washer - C level, large washers - A and C level, large washers - C