规格:2,4,5,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,材质:Q235,2Cr13,35,35Mo等标准很多的.螺栓:六角,方头,圆头,活节,地脚螺母:普通六角,薄型,超薄,滚花,嵌槽,