Home / Standards / GB/T 31.1-2013 GB/T 31.1-2013 Active Hexagon bolts with split pin hole on shank 六角头螺杆带孔螺栓 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 2013-06-09 Implementation 2014-03-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会