Abstract: A ZIF PGA socket of the present invention comprises a base, a cover slidably mounted on the base, a plurality of electrical contacts mounted in the base, a ring insert molded in the cover, and a cam actuator partially received in the ring. The cam actuator comprises a lateral protrusion on an upper lateral side thereof for engaging with one of a pair of flushed stop surfaces on upper sections of the cover and of the ring to determine a respective stop position thereof. The cam actuator of the socket rotates when driven by an externally-applied force, thereby driving the cover slide along the base closing the engagement between the pins of a chip mounted on the cover and the contacts mounted in the base. The cam actuator is prevented from over-rotating by the lateral protrusion thereof abutting one of the pair of flushed stop surfaces. The contacts of the socket and pins of the inserted chip are thereby protected from damage.