Home / Standards / GB/T 6188-2008 GB/T 6188-2008 Abolished 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 废止 Issue Date 2008-08-25 Implementation 2009-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会