GB/T 6138.2-1997 攻丝前钻孔用阶梯麻花钻第2部分:莫氏锥柄阶梯麻花钻的型式和尺寸

标准编号：GB/T 6138.2-1997

标准名称：攻丝前钻孔用阶梯麻花钻第2部分:莫氏锥柄阶梯麻花钻的型式和尺寸

英文名称：Sublandtwist drills for holes prior to tapping screw threads--Part 2:The types and dimensions for subland twist drills with Morse shanks