In the process of high-speed running, the train shall be able to withstand the strong vibration caused by external forces and natural factors, resulting in the continuous decline of the equipment performance of the train, which will inevitably lead to the deterioration of the equipment operation condition and even the damage of components, which will seriously endanger the driving safety. Therefore, the most important link of vehicle overhaul and maintenance, The premise of maintenance and overhaul is that the train shall be well fastened. In view of this situation, it is particularly important to choose a safe, reliable and durable fastening method. Most of the fasteners used in the traditional track system are ordinary nuts and bolts, and then chemical glue is added. However, the chemical glue is easy to age, and the anti loosening effect is greatly reduced after wind and rain. When this traditional fastener is applied to the catenary structure of high-speed railway and motor car, it is very harmful. The fast train speed drives the strong tension to impact the catenary, The anti loosening performance of fasteners is particularly important at this time.

      The new generation of self tightening bolts developed by Zhejiang self tightening Wang Machinery Co., Ltd. through the self tightening principle have high tensile strength, good toughness and corrosion resistance. It can be used under severe working conditions, so as to achieve the effect of complete locking.