Home / Standards / GB/T 3227-2018 GB/T 3227-2018 Active Assembly tools for screws and nuts—Driving squares for power socket tools 螺栓螺母用装配工具 机动套筒工具的传动四方 Standard Type GBT ICS 25.140.01 CCS J48 Status 现行 Issue Date 2018-12-28 Implementation 2019-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A