主营产品：英制螺栓;美制螺栓;ASTM A193 B7/B8螺栓;ASTM A307螺栓;10.9级12.9级螺栓;ASTM A449高强度螺栓;ASTM A354高强度螺栓;ASTM A574合金钢螺栓;ASTM A320低温高压螺栓;ASTM A325钢结构螺栓