Home / Standards / GB/T 20669-2006 GB/T 20669-2006 Active Unified screw threads - Profiles 统一螺纹 牙型 Standard Type GBT ICS 21.040.20 CCS J04 Status 现行 Issue Date 2006-12-08 Implementation 2007-07-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委