Home / Standards / GB/T 28272-2012 GB/T 28272-2012 Active Metric screw threads with extra fine pitch - Series and basic dimensions 米制超细牙螺纹 系列和基本尺寸 Standard Type GBT ICS 21.040.10 CCS J04 Status 现行 Issue Date 2012-05-11 Implementation 2012-12-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委