Socket connector having blind mating structure

An electrical socket connector comprising:

• an insulative base defining an array of passages for receiving electrical contacts therein, and asymmetrically forming blocks at opposite lateral sides thereof;
• and
• a cover slidably mounted on the base, and having mating means corresponding to the blocks;
• wherein the blocks have different lengths along a direction of sliding of the cover on the base, and the blocks asymmetrically mate with the mating means of the cover;
• wherein the mating means comprises first and second side walls depending from opposite lateral sides of the cover, respectively, and the first and second side walls have different lengths along the direction;
• wherein the base includes a first main body with a first header portion on a front portion thereof, the cover includes a second main body vertically aligned with the first main body, with a second header portion located on a front portion of the second main body and vertically aligned with the first header portion and the blocks and the mating means are located around the first and second header portions while far away from center portions of the first and second main bodies;
• wherein a pair of spaced first hook portions depends from a distal edge of the first header portion and a pair of spaced second hook portions depends from a distal edge of the second header portion, which is corresponding to the first hook portions.