M2.5 carbon steel thin head black zinc coating blue patch precision screw

Industry knowledge：

Processing method of screw
1. Turning
The material is made to the desired shape by removing the material
Advantages: high machining accuracy, no mold limit
Shortage: high production cost and slow processing speed
2. Forging
The material is deformed by external force to achieve the desired shape
Advantages: fast production speed, low cost, suitable for mass production
Disadvantages: the forming is limited by the mold, and the mold cost of complex products is high
3. Cold heading: it is a process of extruding and deforming the metal wire with the help of external force in the state of unheated metal wire. The cold heading process is only a kind of forging process.