Screw Drive Types

[Phillip Ford]

> > I sent scans of the articles to be posted, so you can see for yourself
> > later.  The testing was on pan head screws...
>
>Now I'm really confused.  As far as I know, there is no such thing as a
>pan-head screw with a hex socket...at least in the United States.

>Don A. Gilmore
>Mechanical Engineer
>Kansas City



I don't know.  I'm not a fastener authority.  The caption of the graph 
indicated that pan heads having these various drives were used.  You'll 
have to wait for the article to be posted to check it out.  In the 
meantime, here's a sight with similar data, comparing pan-heads with these 
various drives:

http://www.textronfasteningsystems.com/products/torxplus/drive_compare.htm#compare

Go to the link called torsional strength test.  These numbers don't show as 
much differential in capacity between the TORX, the hex, and the Phillips 
as the above article.  But they show that the internal hex will round out 
at only slightly higher torque than the Phillips will cam out and that the 
TORX will develop more torque than either one.  Admittedly, these numbers 
are being provided by the manufacturer of TORX, so caveat emptor.

Phil Ford