Home / Standards / GB/T 9074.9-1988 GB/T 9074.9-1988 Active Cross recessed countersunk head screw and countersunk serrated external toothed lock washer assemblies 十字槽沉头螺钉和锥形锁紧垫圈组合件 Standard Type GBT ICS 21.060 CCS J13 Status 现行 Issue Date 1988-04-16 Implementation 1989-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A