Via the hydraulic cylinder tensioning force is exerted on the bolt causing it to elongate. Our solutions Torque-controlled tightening l In the majority of cases where bolts are used, torque-controlled tightening is the method used to tighten. l With this method the friction on the thread and head of the bolt act as a precise pre-tensioning force, therefore the use of accurate tools is imperative. l Effectively the bolt can be tightened quicker. l This method is more practical and easy. l Light, compact tools can be used where space is limited. 1 Hydraulic Tensioning l As the nut is not rotated under load, there is no torsional load on the bolt. l After achieving the desired applied load, the nut can be tightened without causing stresses on it. The correct applied bolt load is therefore achieved. l Even different co-efficients (levels) of friction have no effect on the tensioning process. 2 Torque/torque-angle-controlled tightening l Torque/torque-angle-controlled tightening is more precise than purely torque-controlled tightening. l The defined amount of rotation of the bolt (torque angle) provides automatically and accurately the required pretension. l Control is achieved directly from the power pack, by means of microprocessor technology within the pump. l Higher quality bolting joints are achieved. l Results can be stored and used at a later date for documentation required in quality assurance processes. l The whole control process is achieved without the need of external sensors, hence no need for extra cables from the tool. 3 7 Bolting Technology
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