Home / Standards / GB/T 6559-1986 GB/T 6559-1986 Active Screw thread shanks for thread forming screw--Metric coarse thread series 自攻锁紧螺钉的螺杆 粗牙普通螺纹系列 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 1986-07-02 Implementation 1987-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A