The jacks TTM type are used for tensioning the strands and are available in three different models depending on the characteristics of use. They are provided with an automatic locking circuit and 4 meter long flexible tubes. The main use of jacks is for tensioning on single strand heads on TTM anchorages. They are available with strokes: 400 mm., 200 mm., 100 mm. and 60 mm., the stroke reduction allows smaller dimensions of the jack.

The M series of jacks is available in nine models which differ according to use characteristics. They are provided with an automatic locking circuit and 10 metre long flexible tubes; they are also equipped with a device rotating on an axis, restricted tensioning extension, and low operating pressure. The jacks are equipped with a metal support, designed in particular to achieve the required inclinations during tensioning operations.
The support is integral with two bearings which enable the jack to turn on its axis, facilitating insertion of the strands protruding from the head. The restricted tensioning extension, the rotation of the jack on its axis and the support allow quick operations and a limited effort during handling.