QJ 2683-1994 MJ螺纹600MPa-235℃碳钢六角开槽螺母... 上一篇:QJ 2684-1994 MJ螺纹600MPa碳钢螺栓、螺钉技术条件下一篇:QJ 2682-1994 MJ螺纹600MPa-235℃碳钢六角螺母