Home / Standards / GB/T 13576.2-1992 GB/T 13576.2-1992 Active Buttress threads with 3 and 30 degrees flank angle--General plan 锯齿形(3°，30°)螺纹 直径与螺距系列 Standard Type GBT ICS 21.040 CCS J04 Status 现行 Issue Date 1992-08-29 Implementation 1993-05-01 Responsible Dept 国家标准委 Drafting Unit N/A