Shear bolts are there to protect the machine from more severe damage. Using too hard of a shear bolt will generally result in something else like an expensive gearbox, or even the PTO on the tractor, getting damaged.
Your bush hog likely requires a special grade shear bolt somewhere between 2 and 5. They probably cost $3 each at the machinery dealer, which is why you are trying to use $3/lb grade 2 bolts.
IMHO, you've got a choice to make:
1. Constantly be replacing bolts.
2. Chance breaking something really expensive.
3. Use the right bolts even though they are more expensive.
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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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