Recently, butterfly washers and double-sided anti loosening washers have been continuously applied in aerospace testing equipment, chemical high-voltage equipment, and precision machine tools. The aerospace industry relies on the elastic compensation capability of butterfly washers to cope with thermal expansion, contraction, and alternating loads; Stainless steel special anti loosening gaskets are selected for chemical working conditions to resist medium corrosion and prevent loose flange connections and leaks in pipelines. With the increasing demand for connection reliability and assembly accuracy in high-end equipment, the industry has eliminated the production capacity of low-end ordinary washers, and high-performance washers such as wedge-shaped self-locking and elastic compensation have become the mainstream direction for selecting fasteners for high-end equipment.