MS21284B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE - STEEL, DOUBLE HEXAGON, EXTENDED WASHER, .500-20 (MIL-S-8879 THREAD) (21 OCT 1991)
MS21284B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE - STEEL, DOUBLE HEXAGON, EXTENDED WASHER, .500-20 (MIL-S-8879 THREAD) (21 OCT 1991).