A co-axial, isolated ground bulkhead receptacle has a metal connector body, a threaded metal mounting
body, and an insulator body having a connector end and a mounting end, a central recess for holding a
center electrical contact, and a radially located slot for holding an isolated ground contact. In a preferred
embodiment, the insulator body has three annular rings at its midsection for securing the respective
annular flange ends of the connector body and the mounting body and for maintaining them in electrical
isolation from each other. The slot in the insulator body and the ground contact have a curvilinear
cross-sectional shape so that the ground contact can be mounted with a constant spacing apart from
the metal mounting body.