An connector (1) includes an insulative housing (2), and a multiplicity of conductive contacts (3) received in the housing. The housing comprises a mating surface (20) and a mounting surface (21) opposite to the mating surface. The housing defines a plurality of passageways (23) extending vertically therethrough to receive corresponding contacts therein. A seriate stand-offs (24) extends from the two opposite lateral sides of the adjacent passageways on the mounting surface.