I was curious about this and a few minutes googling came up with the following:
Here is a website documenting the overall superiority of Grade 8 bolts to Grade
5 bolts in every respect except expense:
http://www.rockcrawler.com/techreports/fasteners/index.asp
This site shows tensile strength of common 18-8 SS bolts vs the others--it is
below Grade 5:
http://www.geocities.com/dtmcbride/home_garden/bolts.html
The first site explains Shear Strength is a percentage function of Tensile
Strength and the Grade 5 bolt has failed before the Grade 8 bolt begins to
distort.
Here is a useful FAQ on bolts, nuts, lockwashers etc:
http://www.boltscience.com/pages/faq.htm
--
Steve Gerow
Pasadena CA
59 BN6
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