Abstract: Two waveguide structures are coupled by connector members that are slideably engaged to one waveguide and adaptable to fixed engagement with the other. Tapered threaded locking pins are threaded through a portion or extension of the waveguide structure that accommodates the slideable end of the connector members. The tapered end of each locking pin engages a tapered recess in a connector member. Longitudinal translation and fixed coupling of the two waveguide structures is achieved by screwing the tapered ends of the locking pins into full registration with the tapered recesses in the connector members. The connector members can be rotatable about the locking pins and partial retraction of the locking pins permits ready disengagement of the connector members from the other waveguide.