Abstract: The disclosure relates to an arrangement of bolt assemblies for connecting one element with another element, the bolt assembly comprising several bolt and hydraulic nut units which each consist of an outer nut and an inner nut which is exteriorly threaded for engagement with the outer nut and is interiorly threaded for engagement with the threads on the bolt, and of a hydraulic component comprising an annular cylinder and an annular piston, the hydraulic component being intended to be placed about the bolt between the nuts and one of the elements, possibly with an interjacent member placed between the element and the hydraulic component, and by means of which hydraulic unit, the bolt can be stretched via one of the nuts for permitting mounting of the other of the nuts in abutment against the hydraulic component which then serves as a form of washer between the nut and the element.