An electrical connector comprising a shell configured to receive an insert assembly (18, 20, 22) used to retain contacts in the electrical connector, the shell comprising an opening extending between a wire receiving face and an oppositely facing mating-connector receiving face, the opening comprising a rear portion with a diameter D1, a front portion with a diameter D2 being smaller than D1, a stop shoulder provided at an intersection of the rear portion and the front portion and a first recess extending from the front shoulder into the rear portion of the opening; the insert assembly (18, 20, 22) comprising: (i) a rear insert comprising: a rear insert front surface, a rear insert rear surface and a rear insert outer surface, the rear insert outer surface extends between the rear insert front surface and the rear insert rear surface; rear insert contact-receiving openings extending from the rear insert front surface to the rear insert rear surface; latches provided in the rear insert outer surface, the latches are provided in alignment with respective rear insert contact-receiving openings of the rear insert contact-receiving openings, the latches are integrally formed in the rear insert outer surface; wherein the latches are positioned proximate to the rear insert contact-receiving openings thereby allowing the latches to deform into the rear insert contact-receiving openings; (ii) a front insert comprising: a front insert front surface, a front insert rear surface and a front insert outer surface, the front insert outer surface extends between the front insert front surface and the front insert rear surface; front insert contact-receiving openings extending from the front insert front surface to the front insert rear surface; a circumferentially extending recess in the front insert outer surface, the recess extending from the front insert front surface towards the front insert rear surface, a wall of the recess providing a stop surface; and (iii) contact retention clips positioned in the front insert contact-receiving openings; characterized in that: the recess of the front insert further comprises crush ribs, the crush ribs being configured to partially deform to conform to and engage the stop shoulder of the shell to prevent unwanted movement of the insert relative to the shell during assembly of the connector. (i) a rear insert comprising: a rear insert front surface, a rear insert rear surface and a rear insert outer surface, the rear insert outer surface extends between the rear insert front surface and the rear insert rear surface; rear insert contact-receiving openings extending from the rear insert front surface to the rear insert rear surface; latches provided in the rear insert outer surface, the latches are provided in alignment with respective rear insert contact-receiving openings of the rear insert contact-receiving openings, the latches are integrally formed in the rear insert outer surface; wherein the latches are positioned proximate to the rear insert contact-receiving openings thereby allowing the latches to deform into the rear insert contact-receiving openings; a rear insert front surface, a rear insert rear surface and a rear insert outer surface, the rear insert outer surface extends between the rear insert front surface and the rear insert rear surface; rear insert contact-receiving openings extending from the rear insert front surface to the rear insert rear surface; latches provided in the rear insert outer surface, the latches are provided in alignment with respective rear insert contact-receiving openings of the rear insert contact-receiving openings, the latches are integrally formed in the rear insert outer surface; wherein the latches are positioned proximate to the rear insert contact-receiving openings thereby allowing the latches to deform into the rear insert contact-receiving openings; (ii) a front insert comprising: a front insert front surface, a front insert rear surface and a front insert outer surface, the front insert outer surface extends between the front insert front surface and the front insert rear surface; front insert contact-receiving openings extending from the front insert front surface to the front insert rear surface; a circumferentially extending recess in the front insert outer surface, the recess extending from the front insert front surface towards the front insert rear surface, a wall of the recess providing a stop surface; and a front insert front surface, a front insert rear surface and a front insert outer surface, the front insert outer surface extends between the front insert front surface and the front insert rear surface; front insert contact-receiving openings extending from the front insert front surface to the front insert rear surface; a circumferentially extending recess in the front insert outer surface, the recess extending from the front insert front surface towards the front insert rear surface, a wall of the recess providing a stop surface; and (iii) contact retention clips positioned in the front insert contact-receiving openings;