During testing on the bench, the rocket combustion chamber is cooled with liquid hydrogen (-190 °C). This leads to dimensional alterations of the structure which can result in leaks and destruction of the material.
Specially designed SCHAAF Hydraulic Nuts provide clamping force which is practically unchanged and, thus, removed the problem.
By consequently applying the axial bolt tensioning technique, SCHAAF High Pressure Hydraulics has solved a serious technological problem and this in a lasting and economic way and with an excellent result. Space reduced and SCHAAF was able to find a design which fulfils