an improved seizure device for connecting coaxial cable transmission lines to electronic devices is disclosed . according to the invention , the center conductor of the coaxial cable is inserted in an opening between two tines of a conductive post which is electrically connected to the electronic circuitry . the outer conductor of the coaxial cable is inserted through a serrated ferrule . a single clamping nut provides a force which acts through the serrated ferrule , a guide clamp and a tapered seizure post holder to simultaneously clamp the inner and outer conductors for electrical and mechanical contact .