m12螺母标准尺寸详图,

不锈钢6175六角螺帽加厚重型螺母m5m6m8m10m12m14m16m18m20m22m24螺母
六角加厚螺母gb61加长螺帽 螺丝帽m3m4m5m6m8m10m12m14m16
gb6184 全金属锁紧螺母 防松螺帽 m3m4m5m6m8m10m12m16m48 镀锌
304不锈钢六角细牙超薄螺母gb808扁螺帽m10m12m14m16m18m20*1x1.
定制10级gb6172六角薄螺母扁螺母螺帽m8m10m12m14m16m18m20m22m24m3