In the method for producing a threaded connection that can be tightened mechanically, in particular hydraulically, the threaded connection having a threaded bolt (20) and a nut (38) having a nut thread, a threaded bolt (20) having a specified screw thread (22) is produced. The threaded bolt (20) is subsequently put into a specified elongated state. Subsequently, the exact geometry of the screw thread (22) is detected in the specified elongated state, an image (34) is created, and the nut thread (36) is produced as a copy of the image that is as exact as possible. The threaded connection that can be tightened hydraulically has a threaded bolt (20) having a screw thread (22) and a nut (38) having a nut thread (36). The nut thread (36) is a copy of an image of the screw thread (22), which image has been obtained from the screw thread (22) in a state that the screw thread (22) has in a specified elongated state of the threaded bolt (20).