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Old 10-24-2008, 04:52 PM   #6
PetersRedYaris
 
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Drives: 2005 Scion xB
Join Date: Nov 2006
Location: The Black Hills of South Dakota
Posts: 1,059
Here, I'll make it easy for you. Here a conversion calculator-

http://www.chapelsteel.com/mpa-psi.html

If you want to enter the numbers yourself, you will see that my origional post stated that a class 8.8 is about equal to a grade 5, which is correct. A class 10.9 is almost identical to a grade 8.

Now that that's sorted out, If you want to say a grade 5 bolt isn't strong enough for this application, that can be your opinion.

120,000 PSi vs. 150,000PSI, BOTH will hold. And of course people are welcome to find a longer class 10.9 bolt to do this mod if they wish.
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