MS51031B, MILITARY STANDARD: SETSCREW-HEXAGON SOCKET, FLAT POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNF-3A, PLAIN AND SELF-LOCKING (22-DEC-1972) [SUPERSEDING MS51032] [S/S BY NASM51031]

MS51031B, MILITARY STANDARD: SETSCREW-HEXAGON SOCKET, FLAT POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNF-3A, PLAIN AND SELF-LOCKING (22-DEC-1972) [SUPERSEDING MS51032] [S/S BY NASM51031].