A coaxial connector includes a center contact, an outer contact and a dielectric insert received in the outer contact and holding the center contact. The dielectric insert may have structural features that extend axially along an exterior of the dielectric insert with air gaps between the structural features. The outer contact may include a rear housing that is interchangeably coupled to either a plug housing or a jack housing at the housing interface. The center contact may be configured to be terminated by a plurality of different termination techniques in different applications.