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10-05-2010 08:49 AM #14
I stand corrected. Upon further review...
“As an empirical guide, shear strengths of carbon steel fasteners may be assumed to be approximately 60 percent of their specified minimum tensile strengths. For example, an SAE grade 5 hex cap screw has a specified minimum tensile strength of 120,000 psi. Therefore, for design purposes, its shear strength could be reasonably assumed to be 70,000 psi.”
The Industrial Fastener Institute (Inch Fastener Standards, 7th ed. 2003. B-8)
Since the tensile strength of a grade 8 bolt is considerably higher the shear strength must be as well. Consider this chart:Hans 
If you can't use me as a good example, then use me as a horrible warning.





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