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 - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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