Abstract: A cable connector includes an outer shell, an outer electrical conductor mounted within the outer shell and defining a first through hole, an insulating housing disposed inside the outer electrical conductor and defining a second through hole, an inner electrical conductor disposed inside the insulating housing and defining an insertion cavity and a connection hole communicating with the insertion cavity, a fastener mounted at least partially in the connection hole and operable to fasten a center conductor of the cable inserted into the insertion cavity, and an insulating ring fitted over the outer circumferential surface of the electrical conductor. The insulating ring is movable between a shielding position in which the first through hole is covered and a non-shielding position in which the first through hole is uncovered to allow the fastener to be exposed from the first and second through holes aligned with each other.