MS21286B, MILITARY STANDARD: SCREW, MACHINE - STEEL, DRILLED DOUBLE HEXAGON, EXTENDED WASHER, .138-40 (MIL-S-8879 THREAD) (17 SEP 1963) [NO SUPERSEDING DOCUMENT]

MS21286B, MILITARY STANDARD: SCREW, MACHINE - STEEL, DRILLED DOUBLE HEXAGON, EXTENDED WASHER, .138-40 (MIL-S-8879 THREAD) (17 SEP 1963) [NO SUPERSEDING DOCUMENT].