Home / Standards / GB/T 5796.1-1986 GB/T 5796.1-1986 Abolished Metric trapezoidal screw threads--Profile 梯形螺纹 牙型 Standard Type GBT ICS 21.040 CCS J04 Status 废止 Issue Date 1986-01-21 Implementation 1987-01-01 Responsible Dept 国家标准委 Drafting Unit N/A