Self-adjusting socket spanner, for hexagonal screw heads or nuts, for torque wrenches of the Click-Torque X and XP series with 14 x 18 mm socket. Covers all metric and imperial dimensions in the respective application area. Thanks to the continuously and parallel jaws, several single spanner dimensions are replaced. The required size adjusts freely by itself when attaching to the hex nut or screw. The integrated lever mechanism securely clamps the hex screw or nut between the jaws, which significantly reduces the risk of slipping and damage. The ratchet function ensures fast and continuous screwing without settling. By using the corner width prisms, a backswing angle of only 30° can be realized.