Place the Back-Up Wrench on the counter nut, then tighten the nut with a torque wrench and remove the Back-Up Wrench easily and safely. Because the tension is released hydraulically no hammer or open-end spanner is needed. Work speed increases dramatically when compared to a standard back-up wrench, because it requires more time to put the wrench in position, to rotate it and then to try and dislodge it.
The hydraulic Back-Up Wrench is available with interchangeable ratchet links from 36 mm to 80 mm (max. 5,400 Nm).