The bars are hot rolled from high strength alloyed steel. They are subsequently cold worked by stretching and then threaded over their full length by cold rolling. The standard range of nominal diameters is: 26.5; 32; 36; 40 and 50 mm. Larger diameter bars can be delivered on request. The fabrication process provides a high quality thread ensuring good fatigue resistance and a low susceptibility to stress corrosion.
The geometry of the thread is specifically designed to ensure ease of use on site, providing fast, accurate and easy tightening.
Bars are available in maximum lengths of 11.7 meters. Beyond this length, extension sleeves allow bars to be connected together.

The anchor devices are designed to anchor the force in the tendon and transfer it to the structure. Three types of anchorages are available: standard anchorages with a nut and washer, hinge anchorages using a nut with a spherical seat, and fixed anchorages using a threaded end plate.
All nuts are hot forged. Also, couplers allow primary bars to be connected to secondary bars.

Freyssinet offer a full range of sheathing that is easy to install. In particular:

Steel strip corrugated sheath, threaded over its full length, which allows easy and fast connections.

High density polyethylene tube, with elements butt welded by means of a heating mirror to achieve a leak free and non corrodible envelope.

Sheathing accessories specific to the tensioning and coupling devices, required to fit the coupler geometry. The length of the ducting element used is defined case by case, so as to allow the coupler displacement over a sufficient length during the tensioning operations.

The fabrication of the bars and the anchorages is carried out under a quality assurance system in compliance with the quality standard ISO 9000 : 2000. Bars and anchorages comply with the requirements of international stan-dards related to prestressing tendons and anchorages.