An item with internal machine threads designed to fit the external machine threads of a tube fitting. It has flat faces, one of which has a counterbored recess to accommodate packing, packing or sealing ring(s), gasket(s), and the like. The item, when installed, provides a method of locking and sealing the connection. See also locknut, pipe; nut (1), tube coupling and nut (1), plain, hexagon.
NSN 5990-00-409-3594
NSN 4140-01-512-6049
NSN 6145-00-681-1585
NSN 6130-01-065-0541
NSN 6130-01-117-4053
NSN 6220-01-302-6001
NSN 4140-01-219-3096
NSN 5910-01-572-4473
NSN 6110-01-006-6718
NSN 5895-01-058-6315
NSN 5975-00-587-4871
NSN 5990-01-633-9503