螺母M12,

不锈钢304 316 din6923m4m5m6m8m10m12六角法兰螺母
304不锈钢六角细牙超薄螺母gb808扁螺帽m10m12m14m16m18m20*1x1.
铜螺母六角螺帽螺丝帽m1.6m3m4m5m6m8m10m12m14m16m18m20
m12四角点焊螺母/304不锈钢四方焊接螺母/gb13680/din928
din929焊接螺母/六角焊接螺帽/细牙六角点焊螺帽m12-1.