广州昕茂五金螺丝有限公司

12.9级外六角螺丝,12.9级公制外六角螺丝,12.9级杯头螺丝、12.9级半圆头内六角螺丝,12.9级沉头内六角螺丝,12.9级无头内六角螺丝,12.9级塞打螺丝,12.9级WT牙螺丝,12.9级外六角螺丝,12.9级细牙螺丝,12.9级美制螺丝,12.9级美制内六角螺丝,12.9级美制外六角螺丝,12.9级英制螺丝,12.9级英制内六角螺丝,12.9级外六角螺丝,12.9级美制细牙螺丝,12.9级公制细牙螺丝,12.9级全牙螺丝,12.9级内六角全牙螺丝.以上产品材质全部采用日本进口的铬钼合金钢（SCM435H）。其洛氏硬度可达39-44之间。