On Apr 14, 4:25�am, "DoN. Nichols" wrote:
On 2010-04-13, DerbyDad03 wrote:

� � � � [ ... ]

Typically, it's coarse thread thread for wood studs, fine thread for
metal studs. The fine thread screws also have a sharper point so they
are easier to start, *especially* when trying to pierce metal studs.

� � � � When my old workplace (a government R&D lab) let out a contract
to re-cover all the 30-year-old linoleum-topped metal desks with new
fake wood (particle board with wood-grain print plastic on it), they
simply dropped the new top over the existing one (made to be a pretty
good fit with sides which overlapped the metal top sides), and used some
intersting screws. �At first glance, they looked like drywall screws,
but examining one showed that instead of having a sharp spiral point,
they had a drill bit point, so they would drill through the metal and
then thread in -- going into pre-drilled and countersunk holes in the
sides of the new top.

� � � � That is now about twenty years ago, so I wonder what the desk
tops look like now. :-)

� � � � Enjoy,
� � � � � � � � DoN.

--
�Email: � � | Voice (all times): (703) 938-4564
� � � � (too) near Washington D.C. |http://www.d-and-d.com/dnichols/DoN.html
� � � � � �--- Black Holes are where God is dividing by zero ---

The screws you mention are for self drilling, self tapping holes in
fairly thick metal. The commonest place you see them is for fixing
steel roofing sheets to girders on agricultural/industrial buildings.
They usually come with a washer with a weather seal under it.