Abstract: A gas- and oil-field pipe joint comprises a female part formed with a frustoconical internal thread and a male part formed with a complementary frustoconical external thread and screwable into the female part with both parts centered on a common axis. The female part further is formed centered on the axis with a frustoconical inner surface axially inward from the internal screwthread and with a frustoconical shoulder surface extending radially inward from the axially inner end of the inner surface. The male part is formed centered on the axis with a barrel portion having an ellipsoidal barrel surface engageable radially with the inner surface and with a frustoconical end surface engageable axially with the shoulder surface of the female part.