Originally Posted by Haggar
Also, I Believe that when this has been stated before, the 8's are still stronger in shear, as well.
8's are stronger all around. A grade 5 will bend before it fails, where a grade 8 won't. Still there is almost no application (besides cost) that a 5 is better than an 8.
The one thing 8's have problems with is that a nick or a notch in the bolt really cut down their strength.