Home / Standards / GB/T 940-1988 GB/T 940-1988 Active Boots for self-locking nuts，twolug，anchor 双耳托板自锁螺母保护罩 Standard Type GBT ICS 21.060.20 CCS J13 Status 现行 Issue Date 1988-12-22 Implementation 1989-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A