FIELD: mechanical engineering, nuts for screw jacks and coupling devices provided with such nuts. SUBSTANCE: nut contains housing provided with a thread for connection with bolt and a number of screws passing through the housing and provided with gear wheels from one end for simultaneous engagement with additional device and simultaneous rotation. Above mentioned construction provides simultaneous rotation of the screws up to the stop at the member and screwing or unscrewing the nut. Coupling device contains the nut and member which simultaneously engages with the gear wheels of the screws and makes them rotate for screwing the nut. EFFECT: improved design excluding misalignment when screwing the nut. 8 cl, 5 dwg
