Assembly for producing a threaded connection for drilling and operating hydrocarbon wells, and resulting threaded connection

The invention concerns an assembly for producing a threaded connection, comprising a first and a second tubular component with an axis of revolution (10) and each respectively provided at one of their ends (1, 2) with at least a first continuous threaded zone (3, 4) following a first helix on the outer or inner circumferential surface of the component depending on whether the threaded end is male or female in type, and being capable of cooperating together upon makeup, the first threaded zones (3, 4) of the ends (1, 2) having a variable width dovetail thread profile, said ends (1, 2) respectively finishing in a terminal surface (7, 8), at least one of the ends (1, 2) being provided with a lip (12) provided between the threaded zone and the terminal surface, said lip carrying a sealing surface (5) which is capable of cooperating in a sealing interference fit with a corresponding sealing surface (6) disposed facing the other end when the connection is in the made up state, characterized in that the lip (12) is hollowed out by a groove (11) adjoining on the one hand the threaded zone and on the other hand the sealing surface, the length (GL) of the groove being calculated as follows (I).