An electrical connector system includes mating pin and socket connectors each designed for increased contact density to improve performance of high-speed data transfer. The connectors include features for retaining a plurality of pin or socket contacts in a ganged, co-aligned configuration and for shielding groups of contacts from one another to reduce interference and crosstalk. The connectors further include features for providing strain relief to the internal wires and/or cables. The electrical connectors further include an electrically conductive grounding contact to latch various internal components of the electrical connector together for improved mechanical connection and shielding properties.