Abstract: A socket (1) mounted on a mother board (5) includes a base (2), an array of conductive contacts (224) retained in the base, a sliding cover (3) and an actuating lever (4). The base includes a body (22) and a mounting portion (21) at a rear end thereof, the body comprising a plurality of through holes (223) for receiving the contacts, the mounting portion having a first surface (212) and a second surface (211) at a bottom thereof. A vertical offset (20) is defined between the first surface and the second surface for compensating for a space formed between the first surface and the mother board due to thermal stress during soldering.