3 possibles:
1: Rivet nuts. These are inserted in a hole, a pulling device screwed=20
in, and the tube is collapsed partially behind the panel to lock it in=20
place.
http://www.mcmaster.com/#rivet-nuts/=3D8ai4kf

2: Barrel nuts: Used a lot in door hardware as tamperproof and=20
aesthetics. Construction slang, we used to call them "Sex Bolts".
  http://www.mcmaster.com/#barrel-nuts/=3D8ai5pq

3: Several others, look at pictures
http://www.mcmaster.com/#nuts/=3D8ai4cl

On 8/6/2010 7:09 PM, peter green wrote:
> When dismantling some items (can't remember what right now) and when
> watching "how it's made" on discovery i've seen a fastner that is
> similar to a screw but rather than having a rod of metal with thread on
> the outside it has a tube with a thread on the inside.
>
> Serveral times i've throught such a fastner would be handy but without a
> name I can't search for suppliers. Anyone here know what it's called?
>   =20
--=20
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