MS21262D, MILITARY STANDARD: SCREWS, SELF LOCKING, 250 DEG. F, CYLINDRICAL HEAD HEXAGONAL WRENCHING SOCKET, ALLOY STEEL, 160 KSI FTU (SOCKET HEAD CAP SCREWS) (16 AUG 1982) [SUPERSEDED BY NASM21262

MS21262D, MILITARY STANDARD: SCREWS, SELF LOCKING, 250 DEG. F, CYLINDRICAL HEAD HEXAGONAL WRENCHING SOCKET, ALLOY STEEL, 160 KSI FTU (SOCKET HEAD CAP SCREWS) (16 AUG 1982) [SUPERSEDED BY NASM21262].