An assembly for producing a threaded connection, comprising a first, a second, a third (PIN-A) and a fourth (PIN-B) tubular component with an axis of revolution; • the first tubular component being provided at each of its end surfaces with a first and a second threaded zone provided on the inner peripheral surface of the component; • the second tubular component being provided at each of its ends with a third and a fourth threaded zone provided on the outer peripheral surface of the component; • the third tubular component (PIN-A) being provided at one of its ends with a fifth and a sixth threaded zone respectively provided on the inner and outer peripheral surface of the component; • the fourth tubular component (PIN-B) being provided at one of its ends with a seventh and an eighth threaded zone respectively provided on the inner and outer peripheral surface of the component; • the first and sixth, third and fifth, second and eighth, fourth and seventh threaded zones being capable of cooperating together in pairs on makeup; • the pitch of the first and sixth threaded zones being equal to the pitch of the fourth and seventh threaded zones; OR • the pitch of the second and eighth threaded zones being equal to the pitch of the third and fifth threaded zones; OR • the pitch of the first and sixth threaded zones being equal to the pitch of the third and fifth threaded zones AND the pitch of the second and eighth threaded zones being equal to the pitch of the fourth and seventh threaded zones, wherein pitch of the first and sixth threaded zones is equal to the pitch of the fourth and seventh threaded zones, characterized in that the sixth threaded zone of the third tubular component (PIN-A) has the same taper as that of the seventh threaded zone of the fourth tubular component (PIN-B), said taper being in the range 5% to 25%, corresponding to a tangent to the peak half angle in the range 0.025 to 0.125, and in that the outer peripheral surface of the third tubular component (PIN-A) has a non-threaded portion preceding its terminal end, provided with a first sealing surface which is capable of cooperating in a sealing interference fit with a corresponding second surface provided on the first tubular component. • the first tubular component being provided at each of its end surfaces with a first and a second threaded zone provided on the inner peripheral surface of the component; • the second tubular component being provided at each of its ends with a third and a fourth threaded zone provided on the outer peripheral surface of the component; • the third tubular component (PIN-A) being provided at one of its ends with a fifth and a sixth threaded zone respectively provided on the inner and outer peripheral surface of the component; • the fourth tubular component (PIN-B) being provided at one of its ends with a seventh and an eighth threaded zone respectively provided on the inner and outer peripheral surface of the component; • the first and sixth, third and fifth, second and eighth, fourth and seventh threaded zones being capable of cooperating together in pairs on makeup; • the pitch of the first and sixth threaded zones being equal to the pitch of the fourth and seventh threaded zones; OR • the pitch of the second and eighth threaded zones being equal to the pitch of the third and fifth threaded zones; OR • the pitch of the first and sixth threaded zones being equal to the pitch of the third and fifth threaded zones AND the pitch of the second and eighth threaded zones being equal to the pitch of the fourth and seventh threaded zones,