Abstract: The firewall feed-through adapter of the present invention, and method for making, is an assembly utilizing an aluminum oxide insulator which is specially machined to interfit with the outer insulation of the conductors. The firewall shell is specially designed to compress the insulator about the conductors and their wire insulation to insure a complete sealing of the firewall side of the adapter. The shell of the adapter is machined both to reduce the labor involved in its manufacture, as well as to provide an internal frusto-conic surface which is used to compress the insulation about the conductors and their wire insulation. The action of securing the shell to the back plate simultaneously seals the shell against the firewall while sealing the insulation against the conductors and the inner surfaces of the shell.

Abstract: A strain-relief end bell for an electrical connector assembly includes a ratcheting mechanism that allows the end bell to resist vibration-induced decoupling once it is threaded onto an electrical connector. The ratcheting mechanism includes a retainer ring that is seated between an internally-threaded coupling ring and an annular fitting around which the coupling ring is rotatably mounted. The retainer ring is fixed to the coupling ring so that both rings are rotatable together. The inner peripheral edge of the retainer ring has a plurality of equidistantly-spaced detents that engage a plurality of rotational bearings on the annular fitting as the coupling ring and the retainer ring are rotated with respect to the annular fitting. The engagement between the detents and the bearings creates a ratcheting effect that restrains the coupling ring from rotating with respect to the fitting unless a manual effort is applied to it.