A coaxial connector assembly includes an outer housing holding an outer contact, a dielectric holder received in the outer contact, and a center contact received in the dielectric holder. The dielectric holder has a front and a cavity extending axially along the dielectric holder bounded by a cavity wall. The dielectric holder has an expansion slot formed in the cavity wall offset from, and proximate to, the front. The center contact has a socket at a mating end configured to receive a pin contact of a mating connector assembly. The center contact has deflectable beams at the mating end configured to deflect outward when mated with the pin contact. The center contact has flared tip ends at the distal ends of the beams. The flared tip ends are received in the expansion slot when the deflectable beams are deflected outward during mating with the pin contact.