Hi all,
 
The wiki for buttress threads states the buttress threads tend to fail
because only the first 4 threads are load bearing. 

In contrast to that is:

www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA483296

Which uses them in a munition where failure us not usually an
option. ;-)

Does anyone have any experience or comments on either US or ISO buttress
(pull) threading. 

I'm trying to concentrate the stress axially rather that trying 
to spread the collar as 60 degrees do.

The reason for my concern is that the collar is welded and the more
safety factor I can generate the better. 

TIA

Dave 


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