MS51491 (NOTICE 2), MILITARY STANDARD: SCREW, CAP, HEXAGON HEAD (FINISHED HEXAGON BOLT), STEEL, GRADE 5 UNC-2A (18 NOV 1999).
MS51491 (NOTICE 2), MILITARY STANDARD: SCREW, CAP, HEXAGON HEAD (FINISHED HEXAGON BOLT), STEEL, GRADE 5 UNC-2A (18 NOV 1999).