An electrical connector includes a dielectric housing and a number of contacts. One side of the dielectric housing defines a number of through passageways for receiving the contacts. The contact includes a retention portion to secure the contact in the dielectric housing. The retention portion defines at least one sunken portion. The housing is stamped out a corresponding number of projecting portions after the contacts are inserted into the housing. The projecting portions engage into sunken portions of the contacts, thereby securing the contacts in the housing.