A nut and ferrule assembly including a nut having an internal-threaded bore along a nut axis and a nut sealing surface, the threads of the internal-threaded bore having a nut thread pitch and a nut thread minor diameter, a ferrule having an annular body forming an axial bore and a ferrule sealing surface, the ferrule sealing surface corresponding to the nut sealing surface, the ferrule further having a protrusion extending outwardly from the body around at least a portion of the body, the outside diameter of the protrusion being greater than the nut thread minor diameter, and the ferrule positioned within the internal-threaded bore.