One of the fastening challenges that the rail transit industry needs to address is how to avoid bolt loosening due to dynamic vibration. In the connection of threaded fasteners, various types of alternating loads may be received under actual application conditions, and the partial failure of the threaded connection is usually caused by its own looseness and fatigue damage. Therefore, how to choose suitable anti-loosening products and rigorous anti-loosening designs for customers in the rail transit industry is one of the important tasks in the design of screwed fastening connections.