Abstract: The present invention relates to a screw actuated mechanical tubular elements connection system to connect a first tubular element provided with a screw hole with a second tubular element via a connector assembly adapted to be inserted into the passages of the tubular elements. The connector assembly includes a rigid body with a foot portion, a movable gripping element, a movable screw actuated portion and a transmission between these movable elements. The tubulars connection system is operable such that upon actuation of the screw, in succession the gripping element exerts a pushing force perpendicular to the wall, to provide a gripping connection between the movable gripping element and the inner surface and an engagement between the foot portion and the opposed inner surface, and a pulling force to pull the second tubular element towards the first tubular element.