Home / Standards / GB/T 12359-1990 GB/T 12359-1990 Abolished Limits of sizes for metric trapezoidal screw threads 梯形螺纹 极限尺寸 Standard Type GBT ICS 21.040.30 CCS J04 Status 废止 Issue Date 1990-06-14 Implementation 1991-05-01 Responsible Dept 国家标准委 Drafting Unit N/A