Coaxial connector

A coaxial connector (100) comprises a center contact (110), an outer contact (114) having a cavity (164), the center contact being disposed in the cavity. The outer contact has a separable interface end (166) configured to be mated to the mating connector, and a terminating end (186) configured to be terminated to an end of a cable. The separable interface end and the terminating end are oriented perpendicular to one another. A dielectric insert (112) is received in the cavity. The dielectric insert has a bore (140) that receives and holds the center contact. The dielectric insert has structural features (146) extending axially along an exterior of the dielectric insert, air gaps (148) are defined between the structural features, and the structural features engage the outer contact to secure the dielectric insert in the cavity.