An electrical connector system includes a header connector that includes a header housing and a header contact. The header housing includes a header base and a header shroud extending from the header base. The header base includes a header contact opening. The header contact is held by the header base within the header contact opening. The system also includes a receptacle connector configured to mate with the header connector. The receptacle connector includes a receptacle housing and a receptacle contact that engages the header contact when the header and receptacle connectors are mated together. The receptacle housing includes a receptacle base and a receptacle shroud extending from the receptacle base. The receptacle base includes a receptacle contact opening. The receptacle contact is held by the receptacle base within the receptacle contact opening. The receptacle contact opening has a common size and shape to the header contact opening.