MS21132A (NOTICE 1), MILITARY STANDARD: WRENCHING ELEMENT, EXTERNAL HEXAGON, FOR THREAD FASTENERS (30 JUN 1988) [SUPERSEDED BY NASM21132]
MS21132A (NOTICE 1), MILITARY STANDARD: WRENCHING ELEMENT, EXTERNAL HEXAGON, FOR THREAD FASTENERS (30 JUN 1988) [SUPERSEDED BY NASM21132].