Abstract: A low cost miniature standard-sized coaxial connector has an increased impedance at its rear portion in a simple and rugged construction. A one-piece molded insulator (16) lies within a sheet metal shell (14) and supports a center contact (18) of the connector. The insulator has a rear portion (34) with a cylindrical sleeve-shaped part (50) closely received within the shell and with three ribs (60-64) extending radially inwardly and having free radially inner ends (68). The center contact has a barb (40) lying in an interference fit within the inner ends of the ribs. The insulator forms a pin lead-in (44) at the front end of the connector, and forms a coupling part (80) between the rearward portion and the lead-in part. The coupling part is in the form of a cylindrical sleeve along its lower half, and has an upwardly-extending slot (82) along its upper half.