An electrical connector and a method of make the same. The electrical connector includes an insulator housing formed with a plurality of through holes extending from a first surface to a second surface of the insulator housing. A flowable polymeric material is located adjacent at least one retention region in each of the through holes. Contact members are positioned within each of the through holes. Energy and/or pressure is applied to the electrical connector so the flowable polymeric material flows into engagement with retention features on the contact members. The electrical connector is cooled so the flowable polymeric material fuses to the contact members in a retention regions.