A connector jack including a molded retainer, a conducting pin centrally located within the molded retainer, and a resilient clamping element. The molded retainer is a cylindrical body having a central recess at its front end for receiving an annular prong of a plug, two slots at its rear end thereof for receiving the resilient element, and a central stepped recess at its rear end and a perforation for receiving the conducting pin. The resilient clamping element has a conducting leg, a fixing leg and a T-shaped stem which connects the two legs. The two legs are insertable into the slots respectively. The conducting leg further includes a semicircular-shaped conducting end at its inner side which projects over the slot into the central recess.