Abstract: A device is provided for a screw connection between two pieces which can adjust the distance between the two pieces. The device comprises a first threaded piece and a second smooth piece with an annular groove close to its free end. A connector ring is screwed onto the threaded shank and engaged on the smooth piece. The connector ring has a groove of variable depth. An incompressible retaining ring is engaged in the grooves of the second piece and the connector ring. The device can be used to produce a single tension element.

Abstract: A shackling device includes a U-shaped member and a pin. The ends of the U-shaped member are provided respectively with a threaded aperture and an unthreaded aperture. One end of the pin is provided with threads which are to be mated with the threads within the threaded aperture. The unthreaded aperture has a diameter which is larger than that of the portion of the pin which is not provided with threads. At least a portion of the unthreaded aperture is of smaller diameter than the diameter of the threaded portion of the pin. An eye is provided on that end of the pin which is not provided with threads.