Home / Standards / GB/T 28253-2012 GB/T 28253-2012 Abolished Thread forming tap 挤压丝锥 Standard Type GBT ICS 25.100.50 CCS J41 Status 废止 Issue Date 2012-03-09 Implementation 2012-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A