Chinese Standard: GB/T 6139-2007

Subland twist drills—Technical specifications

全国刀具标准化技术委员会(SAC/TC 91)

本标准规定了阶梯麻花钻(普通级和精密级)的尺寸、材料和硬度、外观和表面粗糙度、标志和包装的技术要求。
本标准适用于按GB／T 6138.1和GB／T 6138.2生产的攻丝前钻孔用阶梯麻花钻及其他阶梯麻花钻。

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