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Why are 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 result from?
Basically, the explanation is very simple: From the certain pressure limit, the thread flanks are no longer ?strong? enough to resist Trade Secret of the applied pressure. If the pressure is too high, there is a threat of shearing for the thread. By Best-selling , the pressure limits result from DIN EN 837-1.
Attention: The utmost pressure around which a thread can be used depends not merely on the thread diameter, but additionally on the selected sealing type and the material of the counter-thread.