An electrical connector assembly having a snap fit adaptor with bent grounding tangs providing improved electrical contact and enhanced grounding. An electrical connector assembly is adapted to snap fit within a knockout hole of an electrical box or panel for making electrical connections. A snap fit adaptor placed on the outlet end of a connector body has a plurality of locking tangs and grounding tangs. The locking tangs hold the connector assembly onto the electrical box, and a distal trailing edge of the grounding tangs extends into the knockout hole in the electrical box and are curved or shaped to provide a large surface area contact improving electrical continuity and providing enhanced electrical grounding. A safer more reliable electrical grounding connecting is made easily and without tools.