A connecting device, adapted for transmitting pressurized fluids, this connecting device being configured to be coupled with a complementary connecting element, with a first part among the device and the connecting element that is configured to be a male element adapted for being connected to a first line, and a second part among the device and the connector element that is configured to be a female element adapted for being connected to a second line, the connecting device comprising: - a pipe end delimiting an inner flow channel for a fluid flow in the connecting device and including a bearing surface for the connector element; - an end body including a threaded surface for engaging with a body of the connector element and an inner cavity that extends globally along a longitudinal axis of the connecting device and that is isolated from the inner flow channel in the coupled configuration; and - displacement means for moving the pipe end in the cavity of the end body along the longitudinal axis in a forward direction between an unlocked configuration and a locked configuration. wherein the displacement means comprise at least one pivot member, one off-centered member, one connecting rod member and one rear housing that is formed in the end body, defining: - a first articulation diameter (Φ1) between the pivot member and the off-centered member around a first axis, - a second articulation diameter (Φ2) between the off-centered member and the connecting rod member around a second axis, and - a third articulation diameter (Φ3) between the connecting rod member and the rear housing around a third axis; wherein the first, second and third axes (A1, A2, A3) are separate and parallel to a direction transverse to the longitudinal axis; wherein the distance between the first axis and the second axis is smaller than the half-sum of the first diameter (Φ1) and the second diameter (Φ2); wherein the distance between the second axis and the third axis is smaller than the half-sum of the second diameter (Φ2) and the third diameter (Φ3); and wherein the pivot member is movable only in translation along the longitudinal axis relative to the end body and is capable of pushing the pipe end back in the forward direction. - a pipe end delimiting an inner flow channel for a fluid flow in the connecting device and including a bearing surface for the connector element; - an end body including a threaded surface for engaging with a body of the connector element and an inner cavity that extends globally along a longitudinal axis of the connecting device and that is isolated from the inner flow channel in the coupled configuration; and - displacement means for moving the pipe end in the cavity of the end body along the longitudinal axis in a forward direction between an unlocked configuration and a locked configuration. wherein the displacement means comprise at least one pivot member, one off-centered member, one connecting rod member and one rear housing that is formed in the end body, defining: - a first articulation diameter (Φ1) between the pivot member and the off-centered member around a first axis, - a second articulation diameter (Φ2) between the off-centered member and the connecting rod member around a second axis, and - a third articulation diameter (Φ3) between the connecting rod member and the rear housing around a third axis; wherein the first, second and third axes (A1, A2, A3) are separate and parallel to a direction transverse to the longitudinal axis; wherein the distance between the first axis and the second axis is smaller than the half-sum of the first diameter (Φ1) and the second diameter (Φ2); wherein the distance between the second axis and the third axis is smaller than the half-sum of the second diameter (Φ2) and the third diameter (Φ3); and wherein the pivot member is movable only in translation along the longitudinal axis relative to the end body and is capable of pushing the pipe end back in the forward direction.