Diameters of counterbores for hexagon socket head cap screws and screws with cheese head or pan head ; manufacturing dimensions 六角凹头有帽螺钉和圆头螺钉或大柱头螺钉用沉孔直径
Subland twist drills with parallel shank for clearance holes and counterbores for hexagon socket head cap screws and slotted cheese head screws 留隙孔用直柄多刃阶梯麻花钻和内六角头圆头螺钉和一
Subland twist drills with morse taper shank for clearance holes and counterbores for hexagon socket head cap screws and slotted cheese head screws 留隙孔用直柄多刃阶梯麻花钻和内六角头圆头螺钉和一
