Home / Standards / GB/T 6188 GB/T 6188 Active Hexalobular internal driving feature for bolts and screws 螺栓和螺钉用内六角花形 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 2017-12-29 Implementation 2018-04-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会