Home / Standards / GB/T 35-2013 GB/T 35-2013 Active Square head bolts with small head 小方头螺栓 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