Not trying to complicate things but being in the hydraulic Hose game I find an M16 thread is typically .1 - .2mm under size. So smack on 5/8". and the differance between 24tpi and 1mm pitch is about bugger all, 24tpi would be 1.05mm.
So none of this helps explain a thread OD of 16.2mm
Zq
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