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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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。

youdao