... etc.Professional production and processing: nut, nuts, pin shaft, stud bolt,screws, bolts, non-standard bolt, non-standard nut, ... manufacturing fasteners such as bolts,screws,studs,nuts,washers,threaded Rods,pins,rivets,stamping,circlips and other nonstandard parts ... following 7 types:1. High strength alloy steel double end stud- , fully-threaded stud and heavy hex nut applied on petrochemical industry, ...