Home / Standards / GB/T 12-2013 GB/T 12-2013 Active Cup head square neck bolts 圆头方颈螺栓 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