The HYTORC NUT tensioning nut is a 3 part pre-tensioning system for applications with a high degree of difficulty. The special construction allows for the bolt to move with the inner nut without shearing, reaction or torsion forces because the nut does not turn on the flange surface. The bolts are 100% mechanically tensioned. The only system in the world that is delivered pre-calibrated to bolt load. No complex and time consuming measurements therefore need to be carried out during assembly. You can work hands-free, without a reaction arm and without a backup wrench.