MS21289C, MILITARY STANDARD: BOLT, MACHINE-STEEL DRILLED DOUBLE HEXAGON EXTENDED WASHER, 250-28 (MIL-S-8879 THREAD) (15 SEP 1981) [NO SUPERSEDING DOCUMENT]
MS21289C, MILITARY STANDARD: BOLT, MACHINE-STEEL DRILLED DOUBLE HEXAGON EXTENDED WASHER, 250-28 (MIL-S-8879 THREAD) (15 SEP 1981) [NO SUPERSEDING DOCUMENT].