Abstract: A connector for interfacing a circuit resident on a printed circuit board having rows of externally accessible contact pads on a face of the board with a circuit resident on a portable card having rows of externally accessible contact pads on a face of the card has independently biased ball bearing contacts which assure positive, self-cleaning, self-sealing, self-adjusting electrical contact between the circuits.A flat base has rows of apertures therethrough spaced for alignment with the pads of the board when the base is laminarly juxtaposed on the face of the board. Sinks connect the apertures in rows and the conductive ball bearings are retained in each of the apertures by annular shoulders on the apertures. Strips of elastomer formed of layers of conductive and dielectric materials are snugly seated in each sink with the layers transverse to the rows. The strips bias the ball bearings against the shoulders when the base is laminarly juxtaposed on the face of the board.