Subland twist drills for holes prior to tapping screw threads—Part 2:The types and dimensions of subland twist drills with Morse typer shanks
MOD ISO 3438:2003
全国刀具标准化技术委员会(SAC/TC 91)
本部分规定了攻丝前钻孔用莫氏锥柄阶梯麻花钻(普通级和精密级)的型式和尺寸。
本部分适用于M8～M30普通螺纹攻丝前钻孔用莫氏锥柄阶梯麻花钻。
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