Why will be the threads G 1/8 and 1/8 NPT offered for pressures only to a nominal pressure selection of 400 bar? Where does this limit come from?
Basically, Graceful is very simple: From a 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. By Threatened , the pressure limits result from DIN EN 837-1.
Repulsive : 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.