Thin profile board to board connector

A low profile connector (20) includes a receptacle (22) and a plug (70), each having a housing (24,72) with respective arrays of contacts (44,92). The contacts are of thin metal set on edge in the housings and including edge contact surfaces projecting from the housings in a common plane for soldering to the circuits. Each receptacle contact (44) has an arm defining a contact surface adapted to mate with a corresponding plug contact surface. Upon mating of the receptacle (22) and plug (70), the side surface of the post of the plug contact engages the arm of the receptacle contact in sliding engagement. The post co-extends past the arm and in spring biased engagement resulting in a low profile connector (20).