I called Kubota since that's the brand of tractor in question and they didn't know the grade of bolts they sell LOL they said they get them from Bush Hog. Since that's the brand of rotary mower in question I called the local Bush Hog dealer and he said to use grade 2 but if that's breaking too easy to try grade 5 but don't go over grade 5.
I explained my situation to the Bush Hog guy and he confirmed that the bolt that I was asking about is not being used as a shear bolt, it's only holding the shaft onto the tractor pto since the shaft splines would take on the pressure and not the bolt in the case of hitting a stump.
I will be replacing the "shear" bolt on the mower though because I'm not sure what grade that one is.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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