Maximum pressure for pressure connection G 1/8 and 1/8 NPT

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

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