Abstract: A robotic connector or interface includes a roughly conical male member in which the conical side may be concave. The male member includes a radial indexing pin, and a central bore in which polarized electrical connectors are located. A mating female member includes a cavity with a fundus and movable peripheral lips adapted for grasping the base of the male member when engaged for drawing the male member into full mating relation with the cavity. A tapered slot in the side of the female member guides the index pin to impart rotational forces so that mating can take place even if the approach is skewed. The electrical connectors are mounted on a separately indexed, spring loaded connector plate at the fundus of the cavity. A motor-driven linkage operates the peripheral lip members.