M12螺母,m12螺母外形尺寸

9级高强度六角螺母gb6170发黑螺帽m3m4m5m6m8m10m12m14m16-m68
m2m3m4m5m6m8m10m12m14m16m18m27-m30六角螺母平垫片弹垫圈高强度螺丝
m2m3m4m5m6m8m10m12m16m20 din439 六角薄螺帽 薄螺母 304 不锈钢
304不锈钢螺母六角螺母螺丝帽m1.6m2m3m4m5m6m8m10m12
六角焊接螺母 电焊螺母 点焊螺帽焊本色m4m5m6m8m10m12m14m16