Steel Series: steel with high strength large hexagon head bolts, torsion shear bolt connections made, the steel truss joints of high strength bolts, studs, drill the end of wire.
钢结构系列：钢结构用高强度大六角头螺栓，扭剪型螺栓连接副，钢网架球节点用高强度螺栓，焊钉，钻尾丝等。
Specification of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures.
钢结构用高强度大六角头螺栓，大六角螺母，垫圈技术条件。
Specification of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures.
钢结构用高强度大六角头螺栓，大六角螺母，垫圈技术条件。
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