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@JonoMarshall
Tash, you're totally wrong, sorry.
Fixed side of the hub is double threaded... one clockwise thread next to the hub for the sprocket and one anti-clockwise thread (that's slightly smaller in diameter) next to it to thread the lockring onto once the sprocket's in place.
Freewheels don't need lockrings as they only ever have clockwise forces put upon them, so the freewheel side of a hub just has one clockwise thread.
There are loads of threads/images on this forum about it, UTFS a bit more.