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Grade 9 Bolts For Steering Box/brace

Discussion in 'Vendor Forum' started by roadnotca, Jan 18, 2007.

  1. roadnotca

    roadnotca 3/4 ton status

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    HOT Solution for keeping your steering box from coming loose
    180,000 PSI Grade 9 bolts.
    Poser value; 0 :doah:
    Runner value; 10 :wink1:
    GO HERE www.exitengr.com

    brace.jpg

    clip.jpg
     
    Last edited: Feb 15, 2007
  2. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    nice, have a kit to do a steering box?
     
  3. roadnotca

    roadnotca 3/4 ton status

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    Are you referring to stripped threads? If so, yes I will be adding a "Baja-kit", in the next few days. I will PM with specs.
    Brent
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    only problem i see is when thay get harder thay get easyer to snap in stead if smeer and then snap. whats the sheer load specs for these and grd 8 and even grd 5 .

    i have a friend who works on overhead cranes and thay arnt alowed anything over grd 5 as per osha rulesand regs for this reason.
     
  5. roadnotca

    roadnotca 3/4 ton status

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    I wouldn't suggest substituting Grade 5 for the factory installed Grade 8 in the steering box.
    The bolts in the steering box see higher tension than shear.
    Overhead crane(s) are designed with huge margins of safety. The high fastener count becomes as important as the fastener properties.
    Sometimes you wonder if the cranes aren't stronger than the building.:haha:
     
  6. sweetk30

    sweetk30 professional hooker Premium Member

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    true . i just want to get the best facts for any product out there i will be using. some times its best to ask questions like this. :D
     
  7. roadnotca

    roadnotca 3/4 ton status

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    Informed customers are the best!:D
     
  8. Hossbaby50

    Hossbaby50 3/4 ton status

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    Grade 9 bolts there are a great idea. I have replaced my factory grade 8 with new stuff to keep them fresh & I have also installed longer bolts so I can put a locknut on the back side of some of them. I did this to help prevent one of the big problems with steering box bolts is them loosening over time. They still loosen but they do not do it as often.

    I run grade 9 bolts in my crossover steering arm on my 10 bolt. They have done a great job resisting shearing & have been great.

    Harley
     
  9. 79k20350

    79k20350 3/4 ton status

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    Not this again...

    Not true... Although more brittle a grade 8/9 bolt is stronger in ALL aspects. A grade 8 bolt will hold strong when a grade 2/ 5 bend, and will still be holding strong long after either break:rolleyes:
     
  10. 1977k5

    1977k5 3/4 ton status Vendor

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    ^^ What he said ^^
     
  11. roadnotca

    roadnotca 3/4 ton status

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    Thanks Paul.
    EXIT ENGINEERING
     
    Last edited: Feb 9, 2007
  12. kennyw

    kennyw N9PHW Premium Member

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    They are not using SAE Grade 5 or Grade 8 on structural applications. They are buying bolts under a different spec all together... ASTM A325 and A490. The A490 bolts are considered the equivalent of GR 8 and used all the time on cranes. Including this one I'm part of the design team for:

    [​IMG]

    This thing will be lifting 5100 Tons and I can't remember how many bolts it has in the splices... but I know my 1 ton would break if I put all the bolts in the bed at once.
     
    Last edited: Feb 12, 2007
  13. readymix

    readymix 3/4 ton status

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    That is one huge friggen Gantry....

    And I would like to see it in writing that OSHA only allows G5 in a crane???


    Back on topic now:
    Roadnotca, can these be had a little longer so buts could be added on the outside of the gear box? That would just be another thing to ensure that the fasteners don't come loose......we all know how often we actually check torques on those bolts.:D
     
  14. roadnotca

    roadnotca 3/4 ton status

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    I'm woikin on it. It will also accomodate the welded plates.
    Those plates are "1/8" thk, but they are actually .155 thk ea. That leaves the 3" bolt short of full thread in the box. So with welded plates and a brace requires 3 X 4" and 1 X 3" bolts, nuts, washers and a drill to drill-out the box; then we can torque the Grade 9 for all its worth, not just 80 ft. lbs.
    I gotta pull my box, weld the plates and take some pictures.:haha:
     
  15. readymix

    readymix 3/4 ton status

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    I am not wnating to remove the threads in the box.....just add a nut to the outside of it so that there is more than 1 fail point (per say)

    Know what I mean?

    I think it might require that the area n the outside of the box be ground flat so that the nuts could clamp evenly. Should be easy though.
     
  16. roadnotca

    roadnotca 3/4 ton status

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    What happens with the "jam nut" arrangement is it will maintain clamping on the nut side, and loosen on the frame side, thats the longer more flexible path. When the bolt head releases clamping, the frame rips.
    To fix the design is to not rely on the casting threads, they're only good to 80 ft. lbs. You need to open the threads just enough to pass the 7/16 bolt, and clamp the box. This allows a higher torque and much better spread of the load.
     
  17. readymix

    readymix 3/4 ton status

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    Cool, never knew that. Is 7/16 the size that is in there now?
    I never measured it before.
     
  18. roadnotca

    roadnotca 3/4 ton status

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    7/16 X 14
     
  19. kennyw

    kennyw N9PHW Premium Member

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    Another big thing you can do for strength is size the bolt hole so the unthreaded portion is tight in the bolt holes. Basically ream the bolt holes to the size of the bolt shank (unthreaded portion of bolt). It is ok if you have to "lightly" tap on the bolt to get it thru the hole.

    In addition make sure the bolt shank goes thru the frame when assembled (no threads at the frame intersection).
     
  20. roadnotca

    roadnotca 3/4 ton status

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    To fix the design is to not rely on the casting threads, they're only good to 80 ft. lbs. You need to open the threads just enough to pass the 7/16 bolt, and clamp the box. This allows a higher torque and much better spread of the load.
     

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