Grade 5 hardware is cheaper. If you can afford it, no reason why you shouldn't go to grade 8. If not, grade 5 will suffice. Difference in price is worth saving the headache should something break or go wrong. Just my two cents. Good luck!
My Blizzard plow came with Grade 8. There is much less difference in strength between 5 and 8 compared to the difference between 2 and 5. So 5's are probably fine, and cheaper.
Personally, I like to use 8's on most of my projects. If you break off Grade 5's, you are going to bend the frame anyway in most instances. It's a good thought, but I don't think it will hold true as there is not much difference in strength between 5 and 8.
on a plow mount to the frame of your truck you want g5 bolts. the bolts are softer and will wear under use. a g8 bolt will not wear, but your truck frame will. ever see a mount that was all sloppy and the holes on the truck were worn out? g5 bolts will snap off under severe load( stacking/ramming) g8 bolts will trash your truck frame.
i asked this exact question to a dealer 2 weeks ago , for a western ultra... he said GRADE 5, because 8 could bend the frame...5 will shear off
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