An electrical connector interface comprises a plug connector assembly, a receptacle connector assembly, and an anti-rotation fastener receiving post. A plurality of spaced apart conductive contact sockets each have a mating end retained in a monolithic mating portion of a nonconductive plug connector shell body. A plurality of spaced apart conductive contact pins extend into a mating portion of a nonconductive receptacle connector shell body. The nonconductive plug and receptacle connector shell bodies each have an external mounting flange with a anti-rotation aperture. The anti-rotation fastener post has a first anti-rotation end insertable into either the plug anti-rotation aperture or the receptacle anti-rotation aperture.