MS21206A (NOTICE 1), MILITARY STANDARD: WASHER, COUNTERSUNK AND PLAIN, FOR USE WITH BOLTS AND NUTS UP TO AND INCLUDING 220 KSI FTU (18 NOV 1999)
MS21206A (NOTICE 1), MILITARY STANDARD: WASHER, COUNTERSUNK AND PLAIN, FOR USE WITH BOLTS AND NUTS UP TO AND INCLUDING 220 KSI FTU (18 NOV 1999).