A coaxial connector includes a center contact electrically connected to a conductor of a cable. The center contact extends along a contact axis oriented generally perpendicular to an axis of the conductor of the cable. An outer contact has a cavity and the center contact is disposed in the cavity. The outer contact has a separable interface end and a terminating end. The separable interface end and terminating end are oriented generally perpendicular to one another. A dielectric insert is received in the cavity. The dielectric insert has a bore that receives and holds the center contact. The dielectric insert has structural features extending axially along an exterior of the dielectric insert, with air gaps defined between the structural features. The structural features engage the outer contact to secure the dielectric insert in the cavity.