An article such, as an electrical connector, for mounting upon a substrate, such as a printed circuit board. The article includes a mounting plane having locating and centering means thereon. The locating and centering means comprises first and second spaced apart, depending lugs, each of which tapers from a first diameter proximal the mounting plane to a second diameter, narrower than the first diameter, distal said mounting plane. The first lug has a longitudinal slot extending its length in a given direction and the second lug has a longitudinal slot extending its length in a direction orthogonal to the given direction. The slots extending in different directions provide a centering and holding response which fixes the connector in position so that subsequent operations may be performed.