Home / Standards / GB/T 6335.1-2010 GB/T 6335.1-2010 Active Rotary and rotary impact masonry drill bits with hardmetal tips Part1: Dimensions 旋转和旋转冲击式硬质合金建工钻 第1部分：尺寸 Standard Type GBT ICS 25.100.30 CCS J41 Status 现行 Issue Date 2010-12-23 Implementation 2011-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A