ns88级高强度镀锌六角螺母螺帽螺丝母gb6170m6m8m10m12m14m16m20m24m8

定制碳钢锻打gb56gb55六角加厚螺母加高螺母螺帽m10m12m14m16m18m30

定制b6177镀锌平底六角法兰面螺母4m5m6m8m10m12m14自带垫圈光面螺帽

t型螺母t型螺帽t型块m8m10m12m14m16m18m20m30t形螺母88级m8小号底宽

6m2m3m4m5m6m8m10m12m14m16-33 六角螺母m5(100颗)