Home / Standards / GB/T 956.2-1987 GB/T 956.2-1987 Active Countersunk serrated external toothed lock washers 锥形锯齿锁紧垫圈 Standard Type GBT ICS 21.060.30 CCS J13 Status 现行 Issue Date 1987-02-05 Implementation 1988-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A