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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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