A plug connector includes a back shell defining a sleeve having a projection and a locking bale. A connector shell defining a collar is configured to receive the sleeve of the back shell. The collar includes an axial channel to receive the projection of the back shell and a circumferential channel coupled to the axial channel to allow rotation of the back shell relative to the connector shell. A resilient latch is located over the circumferential channel and arranged to be resiliently deflected by the bale when the back shell is rotated about the longitudinal axis between an inserted position and a locked position. The latch including a retention mechanism to retain the bale when fully rotated into the locked position.