A hanger mounted within a bore of a tubular string component has a split ring, a tapered key and a passageway formed in the hanger. The split ring has interfacial surfaces cooperating with interfacial surfaces of the tapered key. The bore may be located within a tubular string component selected from pipe, drill pipe, doubled shouldered pipe, single shouldered pipe, drill collars, reamers, production pipe, composite pipe, well casing, risers, underground utility lines, rotors, positive displacement rotors, jars, shock absorbers, heavy weight drill pipe, hammers, and turbines. A conduit or electronic equipment may be disposed within the passageway. The passageway may be formed in the tapered key or in the split ring. A transmission element may also be disposed within a groove formed in the hanger.