A coupling device (10; 110), adapted to transfer pressurized fluids, said coupling device (10; 110) being connected to a first pipe and configured for coupling with a coupling element (2; 102) connected to a second pipe, with a first part (2; 102) among the coupling device and the coupling element that is configured as a male element and a second part (10; 210) among the coupling device and the coupling element that is configured as a female element, the coupling device (10; 110) including: - an end piece body having a bearing portion and delimiting an internal flow channel of a fluid in the coupling device (10; 110), the end piece body being connected to the first pipe, the bearing portion of the end piece body being capable of coming into sealing contact with the coupling element (2; 102) for sealingly coupling the first and second pipes, - an end piece ring provided with an inner cavity which extends generally along a longitudinal axis and which is isolated from the internal fluid flow channel, and with a radial surface having an external thread, - displacement means for displacing the end piece body, in at least one forward direction parallel to the longitudinal axis of the end piece ring, inside the inner cavity of the end piece ring, and - an intermediate member (60; 160) having a body (61; 161) which extends along a longitudinal axis and which is provided with a radial surface having an external thread (65; 165) complementary to the external thread of the end piece ring, characterized in that the intermediate member (60; 160) also includes a locking mechanism (70; 170) comprising at least a slide or balls, movable radially to the longitudinal axis between, on the one hand, a blocking position wherein the locking mechanism is able to block the coupling element (2; 102) introduced into the intermediate member (60; 160) with respect to the intermediate member (60; 160), in at least one forward direction (D'1) parallel to the longitudinal axis of the body and, on the other hand, a position where the locking mechanism (70;170) allows for the coupling element (2; 102) to be withdrawn from the intermediate member (60;160), and in that while the intermediate member (60; 160) is uncoupled from the end piece ring, the locking mechanism (70; 170) is able to be located in the blocking position thereof, in which the slide or the balls block the coupling element (2; 102) in at least the forward direction (D'1). - an end piece body having a bearing portion and delimiting an internal flow channel of a fluid in the coupling device (10; 110), the end piece body being connected to the first pipe, the bearing portion of the end piece body being capable of coming into sealing contact with the coupling element (2; 102) for sealingly coupling the first and second pipes, - an end piece ring provided with an inner cavity which extends generally along a longitudinal axis and which is isolated from the internal fluid flow channel, and with a radial surface having an external thread, - displacement means for displacing the end piece body, in at least one forward direction parallel to the longitudinal axis of the end piece ring, inside the inner cavity of the end piece ring, and - an intermediate member (60; 160) having a body (61; 161) which extends along a longitudinal axis and which is provided with a radial surface having an external thread (65; 165) complementary to the external thread of the end piece ring,