MS51023C, MILITARY STANDARD: SETSCREW-HEXAGON SOCKET, CUP POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNF-3A, PLAIN AND SELF-LOCKING (29 DEC 1972) [

MS51023C, MILITARY STANDARD: SETSCREW-HEXAGON SOCKET, CUP POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNF-3A, PLAIN AND SELF-LOCKING (29 DEC 1972) [S/S BY NASM51023].