It looks like some type of flare rather than a separate fitting...
Boy, that does look similar. Mine is steel.I did find this but it's aluminium and for AC I believe. Now they "may" been made in steel years ago and work for Hydro. I don't know and YMMV but it may provide a clue.
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BL08-08TM45T | 13/32" Hose x 1/2" O-Ring 45° (Aluminum)
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There was no o-ring on it when I took it apart.Is there an o ring in the female end? I've seen stuff like this in oil and AC applications just not in hydraulic, but there is always a first.
I have a feeling that someone "improvised" on this already. That is how this part got in there.If you have to improvise...compression type fittings may be an option using the original end...If the tube part is a typical size...