John!
Thanks for the call last week.
My two cents here regarding your O-ring boss question:
O - ring boss..,
In the nuclear industry,
We refer to your fitting as an “SAE/MS Straight thread (ST)”
I refer to SAE J1926/1 and ISO 11926-1 regarding straight thread boss fittings.
P.S. it’s confusing
P.S.2: The only reason an o-ring boss will fail is if you don’t lubricate the o-ring during installation.., but you already know that.
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