... 10 years experience of springs production 3.OEM customization springs Heavy duty compression springs with large diameter :1.10 years experience ... areas: product diameter 0.08mm-8.0mm6.CNC spring machine main equipment: CNC502,CNC620,CNC650,MEC,CNC 8HS,grinding ... treatment, shot peening machines and test equipment7.CNC spring machine a process: nickel plating,Zinc plating, coating, Chrome plating8. ...