A connector (100) comprises a center contact (20) connected electrically with an internal conductor, a tubular member (60) enclosing the center contact (20) and connected electrically with an external conductor, and an insulating member (70) isolating the center contact (20) electrically from the tubular member (60). The center contact (20) has a threaded part (22) for engagement with the internal conductor. The threaded part (22) includes a first screw with a first pitch smaller than the pitch of a corrugated tube.
