Home / Standards / GB/T 2670.2-2017 GB/T 2670.2-2017 Active Hexalobular socket countersunk head tapping screws 内六角花形沉头自攻螺钉 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 2017-07-12 Implementation 2018-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会