Abstract: The electrical interface of two sets of wires is accomplished with the use of a conically shaped male plug, a female socket, an indexing key and a self locking center bolt. The male plug terminates a first set of wires in a plurality of contacts on its conically shaped mating surface. The female socket terminates a second set of wires in a concave conical surface which is complementary to the mating surface of the male plug. The self locking center bolt is inserted through the female socket into an insert within the male plug, and provides a means for early engagement and locking between the male plug and female socket that prevents contacts from prematurely making any contact. The indexing key is a longitudinal protrusion on the female socket which fits into a complementary slot on the male plug to align the contacts of the first and second set of wires to ensure a proper connection between the two sets of wires.