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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
... [Read Article]
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