Standard: Din914 / Din915 / Din916 Specification: M3-M20 los yog kev cai Khoom siv: 35K, 45 #, 40Cr (SAE1045, 5140), SS304, SS316 tsim txheej txheem: Hlau pas nrig → Anneal → Acid cleaing → Kos hlau → molding thiab dov xov → Thaum tshav kub kub kev kho mob → deg kho → Packing deg treat: Plain, Dub oxide, Blue dawb zinc, Daj zinc, Kub poob galvanized, Tooj plating, Kub plating, Chromium plating. Tswjhwm: Raw khoom tshawb xyuas → txheej txheem saib xyuas → khoom kuaj → Ntim check Certification: ISO9001: 2008 Ntim: chob ...