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Factory Price ASTM A563 Grade C Heavy Hex Nuts Hot DIP Galvanized for Steel Structure Bridge Hex Headd Nut, Find Details and Price about Heavy Hex Nut Hex Head Nut from Factory Price ASTM A563 Grade C Heavy Hex Nuts Hot DIP Galvanized for Steel Structure Bridge Hex Headd Nut - Sanma Fastener (Zhejiang) Co., Ltd