When rebuilding an old cultivator, or any old attachment for that matter, which grade is typically used for the general frame hardware bolts? I am working on an old Dearborn cultivator and I'm replacing most of the bolts due to rust as I make adjustments to it. I'm not refurbishing it, but getting it back into working order as a rusty old tool. These are bolts that hold bracing, the arms that hold the springs, and miscellaneous frame parts together. I've used a little bit of each grade during past projects but figured there must be a "right answer". The old bolts are too rusted to see any markings. So what's the best grade to use for holding an implement together but not subjected to extreme forces? Grade 2, 5, or 8?
Replacing bolts - which grade?
- Thread starter Ford850
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leonz
Super Member
Use grade five NFT with blue "Loctite" no worries.
LD1
Epic Contributor
Grade 5 or Grade 8 will work just fine.
I typically use Grade 8 because that is what I have the most of laying around. So If you have some grade 8's, dont feel like you have to run out and buy the gr5's, because 8's will work just as good.
But if you are short on bolts and HAVE to buy anyway, 5's will be cheaper:thumbsup:
I typically use Grade 8 because that is what I have the most of laying around. So If you have some grade 8's, dont feel like you have to run out and buy the gr5's, because 8's will work just as good.
But if you are short on bolts and HAVE to buy anyway, 5's will be cheaper:thumbsup:
LD1
Epic Contributor
Thats the best that I have found:thumbsup:
Mock1
Silver Member
My two cents. Grade five. Best of both worlds. Not as soft as a grade two shear bolt, but not as fragile as a grade eight bolt. A grade eight won't stretch that much, and a grade two will stretch forever. There are Engineering terms for this, But I'm too lazy too look them up.