Extension sleeves are used to extend and secure the tension rods. They are made of S540N or S355 and have continuous, right-hand internal threads.
For additional safety, the threads of BESISTA® sleeves are longer than necessary.
Note: The tension rods must be securely locked at the sleeve centre to ensure that the complete rod is turned when tensioning. The thread screw-in depth is reached when the rod threads project from the sleeve on both sides by no more than 4 thread pitches.
The tensioning sleeves with left- and right-hand threads are used to pretension the tension rods. They can also be used as “turnbuckles”, e.g. in order to increase the adjustment distance.
Note: The required thread screw-in depth is reached when, after the tensioning process, the threads are visible in both inspection holes.