For the archives... There is a "class 12.9" but this is a metric designation that is roughly equivalent to a SAE grade 8. Metric head stampings are also different from SAE, and usually indicate the tensile strength of the bolt in metric units. Both bolts are rated with an ultimate yield strength of about 150,000 psi.
I have not yet come across a bolt rated higher than this, but am willing to learn if there is in fact someone who manufactures such an item.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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