Home / Standards / GB/T 1438.3-2008 GB/T 1438.3-2008 Active Taper shank twist drills - Part 3: The types and dimensions for lengthened Morse taper shank twist drills 锥柄麻花钻 第3部分：莫氏锥柄加长麻花钻的型式和尺寸 Standard Type GBT ICS 25.100.30 CCS J41 Status 现行 Issue Date 2008-11-04 Implementation 2009-04-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会