HNU440S6SSSM
439 HEX NUT - thread: 4-40, Thread Size: 1/8", Nut Height: 1/8", Head Width: 1/4", corrosion resistant steel, MS35649 series nut
NASA6MC
439 HEX NUT - thread: 4-40, Thread Size: 1/8", Nut Height: 1/8", Head Width: 1/4", corrosion resistant steel, MS35649 series nut