The hexagonal self-locking nut contains a nylon insert. Made from carbon steel with cadmium type II finish per QQ-P-416. MS21044 series nut.
NUT,SELF-LOCK,HEX, NUT, AN365-524, AN365-524C, AN365-524A, MS20365-524, MS20365-524C, MS20365-524A, NAS1021N5