... and processing: nut, nuts, pin shaft, stud bolt,screws, bolts, non-standard bolt, non-standard nut, non-standard screws, egg neck bolt, fish bolt, countersunk head bolt., expansion bolt and ... 4.8 and 8.8.4. Elevator guide rail bolt and big hexagon bolt for steel structure, shearing bolt with ... 304, 316, 316L.6. International internal and external hexagon bolt with the mechanical property of Grade 4.8, ...