MS21290B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE - STEEL, DRILLED DOUBLE HEXAGON, EXTENDED WASHER, .3125-24 (MIL-S-8879 THREAD) (21 OCT 1991)
MS21290B (NOTICE 1), MILITARY STANDARD: BOLT, MACHINE - STEEL, DRILLED DOUBLE HEXAGON, EXTENDED WASHER, .3125-24 (MIL-S-8879 THREAD) (21 OCT 1991).