I think its called a Double Lead screw.
http://www.mcfeelys.com/html/ttp.html
> I'm attempting to restore a pair of speakers and trying to find a mystery
>screw. It appears to be a 1/5" #12 wood screw with a
double thread (that's the mystery part). Threads start near the head at 180
degrees apart and wind down the shank. It makes a very
tight thread spacing. Have any of you seen such a screw? And what is that
double thread officially called? The counter men at my
first two hardware stores thought I was a little crazy, even with the old rusty
screw in hand.
>
> Thanks,
>
> Ken
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