That’s exactly what it’s forI have one, some car fan switches use 22x1.5mm.
Drill service have most stuff on the shelf.
Machine tap would be great for making these on the lathe I just took it easy by hand with the centre pushed in the back and an adjustable.I got asked a few times about adding a fan switch boss to my rad tubes, I even single pointed
a fitting for someones tubes.
Then I scored two brand new guhring machine taps on ebay, obviously not been asked since;-)
I think I flogged one of the taps to someone who posted a similar question to yours.