Abstract: A waveguide interconnection system. First and second waveguide sections each have an exterior end and an interior end. A first flange, formed in a cylindrical configuration, has an inboard surface in a planar configuration positionable adjacent to the first waveguide section adjacent to the interior end thereof. The first flange has an outboard surface, a peripheral exterior surface with male threads formed thereon, and an opening therethrough essentially coextensive as an extension of the cross-section of the waveguide. A second flange, formed in a cylindrical configuration, is positionable adjacent to the second waveguide section adjacent to the inboard end thereof. The second flange has an outboard surface and an inboard surface in a generally planar configuration with a peripheral surface therebetween and an opening centrally therethrough essentially coextensive as an extension of the cross-section of the second waveguide.