It seems fairly clear that you are dealing with a patent here and I would say that "screwably guided" would not be appropriate, even for patentese. I think simply "can be screwed into a thread situated ..." would be considered acceptable.

I've found a patent example going in the other direction for you.
An English-language EP (although originating from Italy):
and a second ring nut 40 which can be retained in the box-like support 38 and can be screwed onto the aforesaid second thread 39.
http://worldwide.espacenet.com/publicationDetails/descriptio...

And here is the corresponding German translation of this document:
weiter eine zweite Ringmutter 40, die in dem dosenförmigen Träger gehalten bleiben kann und auf dem vorgenannten zweiten Gewinde 39 schraubbar geführt ist.
http://www.patent-de.com/20080306/DE602004007168T2.html

You will also probably find this interesting - a US patent (translation) correpsonding to what I presume is your document. This particular translator has used "threadedly connected".
The side of the intermediate piece 36 opposite the tappet 32 is equipped with a peg-shaped extension which, on the one hand, serves to receive a springy element--described in greater detail below--and, on the other, is longitudinally movably led in a thrust piece 38 which in turn is threadedly connected to upper part 4 in the interior of the top
37.
http://www.freepatentsonline.com/6029705.html