Double nut for the controlled tightening of a part by means of a screw connection

A double nut for a controlled fixing of a component by means of a bolt connection, comprising:

• a pulling sleeve having an internal thread, which is adapted to be screwed onto a threaded end of a bolt, and also having an external thread;
• and
• a pressing sleeve that is adapted to be supported on said component, wherein said pressing sleeve has an internal thread via which said pressing sleeve is adapted to be screwed onto said external thread of said pulling sleeve, wherein said internal thread of said pressing sleeve engages said external thread of said pulling sleeve to such an extent that said internal thread of said pressing sleeve is spaced by a distance equaling several threads from an end of said pulling sleeve that faces said component, and wherein said external thread of said pulling sleeve is furthermore adapted to threadedly receive a pull bushing of a hydraulic or pneumatic bolt-tightening cylinder that is also provided with a support bushing that is adapted to be supported on said component and to extend over said pulling sleeve and said pressing sleeve.