... : DIN ,ANSI/ASME, BS, GB, JIS, Non-standardMaterial: Carbon steel, stainless steel, alloys steel.Class: 4.8,8.8,10.9,12.9 ... Arabia, Europe, South Korea, Southeast Asia, etc. Professional production and processing: nut, nuts, pin shaft, stud bolt,screws, bolts, non-standard ... .4. Elevator guide rail bolt and big hexagon bolt for steel structure, shearing bolt with mechanical property of Grade 8.8, 10 ...