[T3] [T-3] Screw sizing

[Dave Hall]

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
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-----Original Message-----
From: type3-vwtype3.org-bounces at lists.vwtype3.org
[mailto:type3-vwtype3.org-bounces at lists.vwtype3.org] On Behalf Of
Bobsnotch at aol.com
Sent: 13 December 2010 03:13
To: type3 at vwtype3.org
Subject: [T3] [T-3] Screw sizing

I asked this over on the Samba, but haven't had any replies, so I thought
I'd ask here.
Does anybody have a conversion chart for metric sheet metal screws to the
American sizes? What I'm looking for is a conversion from 2.9 and 3.9 into
the  US standard. Would these be #4 and #6 equivalents? I'm only asking,
because I  want to get some replacement screws for the upper trim and other
various parts  on the t-34, but would like to get them in stainless steel. 
Nobody offers them  in SS in metric sizes around here. Thanks for any help
you can give me.
 
 
Bob 65 Notch  S with sunroof and IRS (Krusty)
71 Notch (Krunchy)
64 T-34 Ghia  (Wolfie)
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