In my limited experience, shear bolts are an iffy piece depending upon ones conditions. The grade 1 or so in the flair mower worked just fine as it was just twirling away spinning grass cutting blades that never impacted anything substantial. However, My Fred Cain subsoiler's shear bolt snapped every time it dove into my very rocky soil; I could not get any work accomplished and it was frustrating. I went to grade 5 bolts and all is well with no shear bolt breakage and no damage to the equipment.
If I had an auger's gear box to content with in my soil, I would use a slip clutch, which I have in storage waiting for my auger selection.
If I had an auger's gear box to content with in my soil, I would use a slip clutch, which I have in storage waiting for my auger selection.
