[T3] [T-3] Screw sizing

[Bobsnotch at aol.com]

In a message dated 12/13/2010 6:34:51 P.M. Eastern Standard Time,  
dave at hallvw.clara.co.uk writes:

Well, as  I understand it, #4 and #6 are the order of the drills in a full
set  starting from 1/16" and going up in 1/64", so #4 is 7/64"  and #6  is
9/64".  Multiply those by the conversion factor of 25.4mm per inch  gives
2.78mm and 3.57mm.  The first is close, but 3.9mm is closer to  #7, which
would be 5/32" or 3.97mm.  I don't know if you can get #7  screws though.  

I hope that helps, and if it's rubbish, I'm  sorry.   It took me half a
lifetime to realise that screw numbers  related to the order of drills in 
the
normal set, then they went and  adopted the metric system for engineering.
It's the clearance hole for the  screw, as I recall.  

I'm about to be involved with a UK school  building a Rans S6 aeroplane kit,
with Imperial sized everything!  So  having taught kids to measure 
everything
in metric, we will now have to  help them get used to our old ways, as well
as get used to them again  ourselves.

Dave.
UK VW Type 3&4 Club




Well, that does help, as the #4 seemed a little small, and the next size up 
 is a #6 that seemed almost too big. Our screw system seems to go in even 
numbers  from #4 up to #14, then it changes to fractions (at least at the 
hardware  store). So it does get a little complicated. Unfortunately, they 
don't offer  metric sheet metal screws (in zinc or SS), so that means you're 
kind of SOL  around here. Thanks for the help though Dave.  

Bob 65 Notch  S with sunroof and IRS (Krusty)
71 Notch (Krunchy)
64 T-34 Ghia  (Wolfie)
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