Hydraulic bolt tensioner
max. 1996 kN | STC series QUIRI

Principle of operation
A bolt tension cylinder fitted with an internally threaded brace is attach to a bolt. By applying hydraulic pressure with the aid of a pump the bolt is pulled in an axial direction. The nut can then be simply tightened by hand through the opening in the skirt. When hydraulic pressure is released the correct bolt tension is achieved.

Selection of a tension cylinder
When selecting a bolt tension cylinder you should keep to the following rules :
* The brace thread must be same as the bolt thread.
* Before assembly check that the nut is fully screwed down.
* Check that there is sufficient room around the bolt to accommodate the QUIRI bolt tension cylinder. If there is insufficient space for the standard unit please check with our technical department for a solution.
* Check that the bolt thread is long enough to allow the correct engagement of the brace insert.
(Length of thread above the nut should be at least equivalent to the diameter of the bolt, ie. M24 bolt thread length 24 mm).