An electrical connector (100) for mating with a mating connector includes a housing (1) defining a receiving cavity (10), a rear insulator (32), a central pin (7), a front insulator (31) and a contact member (5) received in the receiving cavity. The contact member includes a first through fourth side walls (513a-513d) surrounding an inserting slot (514), a pair of resilient beams (515) respectively bent from the second and the fourth side walls toward the inserting slot for clasping the mating connector. The first side wall includes a first edge portion (511) having a first protrusion (519) and a first cutout (518) in front of the first protrusion, and a second edge portion (512) having a second protrusion (516) engaged with the first cutout and a second cutout (517) behind the second protrusion and engaged with the first protrusion.