Home / Standards / GB/T 6135.1-2008 GB/T 6135.1-2008 Active Parallel shank twist drills - Part 1: The types and dimensions for small type twist drills with oversize parallel shank 直柄麻花钻 第1部分：粗直柄小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