Why will be the threads G 1/8 and 1/8 NPT offered for pressures and then a nominal pressure selection of 400 bar? Where does this limit come from?
Basically, Teetering is simple: From the certain pressure limit, the thread flanks are no longer ?strong? enough to resist the force of the applied pressure. If the pressure is too high, there is a threat of shearing for the thread. Incidentally, the pressure limits come from DIN EN 837-1.
Attention: The maximum pressure around which a thread can be utilized depends not merely on the thread diameter, but also on the selected sealing type and the material of the counter-thread.