Home / Standards / GB/T 15856.4-2002 GB/T 15856.4-2002 Active Hexagon flange head drilling screws with tapping screw thread 六角法兰面自钻自攻螺钉 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 2002-12-05 Implementation 2003-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会