Abstract: An interface device for tensioning or relaxing a bolt in a nut-and-bolt assembly wherein the bolt extends in an axial direction. The interface device comprises a frame having a first end portion and a second end portion. The first end portion is provided with a rotatably-mounted nut ring for receiving and rotating a conventional nut on the bolt. The second end portion comprises a mechanical tensioner nut configured for reacting on the frame and for receiving a part of the bolt that extends beyond the conventional nut. The mechanical tensioner nut is configured for being driven by a low-pressure torque tension tool to tension or relax the bolt in operational use of the interface device. The device provides a very compact torqueing solution for use with low-pressure torqueing tools.

Abstract: The invention relates to an interface device (100) for tensioning or relaxing a bolt (10) in a nut-and-bolt assembly (10,20), wherein the bolt (10) extends in an axial direction. The interface device (100) comprises a frame (150) having a first end portion (100-1) and a second end portion (100-2), opposite to the first end portion (100-1). The first end portion (100-1) of the frame (150) is provided with a rotatably-mounted nut ring (130) for receiving and rotating a conventional nut (20) provided on the bolt (10) in operational use of the interface device (100). The second end portion (100-2) of the frame (150) comprises a mechanical tensioner nut (190) being configured for reacting on the frame (150) and for receiving a part of the bolt (10) that extends beyond the conventional nut (20) in operational use of the interface device (100).