MS21293B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE-STEEL DRILLED DOUBLE HEXAGON, EXTENDED WEATHER, .500-20 (MIL-S-8879 THREAD) (ASG) (21 OCT 1991) [NO SUPERSEDING DOCUMENT]

MS21293B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE-STEEL DRILLED DOUBLE HEXAGON, EXTENDED WEATHER, .500-20 (MIL-S-8879 THREAD) (ASG) (21 OCT 1991) [NO SUPERSEDING DOCUMENT].