This is one of those perennial questions that pops up every so often with little agreement and no resolution. I use grade 5 bolts on my brush hog, which gets pretty rough service. I'd be replacing pins hourly if I used grade 2. Obviously softer bolts would be easier on the gearbox.
I try to avoid using grade 2 fasteners for ANYTHING. I like to think of them as "grade UNKNOWN", because you really don't know what you're getting when you buy Chinese "grade 2" bolts at your local hardware store. After all, a grade 2 bolt has no markings.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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