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What grade of bolts to attach plow frame to truck frame?

Discussion in 'Truck & Equipment Repair' started by W250CTD, Dec 8, 2008.

  1. W250CTD

    W250CTD Junior Member
    Messages: 26

    Looking over instructions for many frames, grade 5 bolts are mostly used. Is there any reason to use grade five and not grade 8? Thanks
  2. PinkyRingz

    PinkyRingz Member
    Messages: 39

    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!
  3. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    You hit something do you want the bolts to break or you plow frame bent. It's the same way for your cutting edge bolts ,you want them to break off.
  4. PinkyRingz

    PinkyRingz Member
    Messages: 39

    thats a good point...never thought of that...lol...learn something new everyday!! Better listen to that guy! lol :p
  5. hydro_37

    hydro_37 PlowSite Veteran
    from iowa
    Messages: 3,790

    Definately use grade 5. The instructions say that for a reason.
  6. JCByrd24

    JCByrd24 Senior Member
    from Maine
    Messages: 232

    Grade 8s are also more brittle which may be why they are not specified for use in the cold where shock/slamming loads are present frequently.
  7. Plowinpro03

    Plowinpro03 Senior Member
    Messages: 151

    Very good point...........
  8. snowandgo

    snowandgo Senior Member
    Messages: 143

    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.
  9. fastjohnny

    fastjohnny Senior Member
    Messages: 653

    I'd say this depends. I've broke metric 8.8's on my mount, with no damage to either mount or truck. Replacement upgrade to 10.8 IIRC.
  10. beatle78

    beatle78 Senior Member
    Messages: 175

    I put all grade 8 hardware on my push plates.
  11. Spitz

    Spitz Senior Member
    Messages: 192

  12. beatle78

    beatle78 Senior Member
    Messages: 175

    I like that link Spitz, thanks.
  13. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    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.
  14. elite1msmith

    elite1msmith 2000 Club Member
    from chicago
    Messages: 2,762

    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