shaped fasteners

The accurate definition shall be: non-standard special-type fasteners. With the common use of the fastener forming process from cutting processing, hot forging processing to cold upsetting process, a variety of industrial application needs that the existing standard fasteners cannot meet have become the motivation for the development of non-standard special fasteners. The cold heading process such as feeding-extrusion compression diameter-pier step-optical punching molding, and two-mode cold-stroke machine on line brush parts, four-station cold-heading machine, machining of special nuts are widely used in engineering pump truck, pipe connection and special machinery.