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ASTM A325 A325m A490 A490m Type-1 HDG High Strength Carbon Steel Structure Hexagon Bolt with Nuts Washers, Find Details and Price about Bolt and Nut Bolt Nut from ASTM A325 A325m A490 A490m Type-1 HDG High Strength Carbon Steel Structure Hexagon Bolt with Nuts Washers - T&Y Hardware Industry Co., Ltd.