SKRUKOBLING FOR STAALROER, FREMGANGSMAATE FOR DENNES FREMSTLLING OG APPARAT FOR FREMGANGSMAATENS UTFOERELSE.

摘要

The present invention concerns a new threaded joint for steel tubes, usable in particular in the petroleum industry, which contains a female element equipped with conical threads having an internal screw stop mating and a male element correspondingly threaded with a screw stop having a form corresponding to the female element. The male element stop and the female element stop are each manufactured by cold working using a tool capable of engaging in or on the threads of the corresponding element.