The admissible pressure depends on design and size.
Hydraulic cylinders of the 120 series with a bore diameter of 200 or more may be run with 200 bar. Depending on how they are fixated, the bore diameters 25 through 180 of the 120 series can be run with 15 MPa at most.
Every hydraulic cylinder is tested in the factory:
Test pressure = 1.5 x max. operating pressure.
With the respective type of fixation, the operating pressure indicated in the parts list can be exploited statically and dynamically without restrictions. However, the safety respectively required in your system and the stress caused by dynamic movement must be taken into account.