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@hugo7
You need to do some reading up.
This is what the freewheel side of hub will look like:
You screw the freewheel onto that thread.
On a fixed hub there will be an extra thread like this:
This is because you need to screw a lock ring on after to stop the fixed cog unscrewing. You do not need to do this on a freewheel because the internal mechanism means the whole thing won't unscrew.
You screw a freewheel onto a fixed cog. For this reason there is no point in not having a thread which alows you to screw a lockring on.