ANSI/ASME B18.2.1,JISB1180,GB/T5780-GB/T5783,ISO4016-ISO4017,DIN558, DIN601 , DIN933 , DIN931 , B.S.W916
All Hexagonal Head bolts are manufactured by the process of hot up-setting and forming operations. After heat treatment, threads are produced by rolling operation and the parts show high strength, high temperature resistance, fatigue resistance, self-locking, high accuracy for threads, new design and corrosion resistance. They are widely used.