MS51031 Flat Point Hex socket Set Screw, Corrosion Resisting steel, passivated, UNF-3A, Plain and Self locking (S/S By NASM51031, 22 DEC 1972). Socket Set Screws come in different types and sizes including: AN565, MS18063, MS18064, MS51021, MS51023, MS51029, MS51031, MS51038, MS51045, MS51963, MS51964, MS51965, MS51966, NAS1081. MS51031B, MILITARY STANDARD, SETSCREW-HEXAGON SOCKET, FLAT POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNF-3A, PLAIN AND SELF-LOCKING (22 DEC 1972) [S/S BY NASM51031]