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Bolts?

Discussion in 'Early CJ5 and CJ6 Tech' started by Don X, Jun 12, 2018.

  1. Jun 12, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    Bolting a tub to the frame. Are there any advantages or disadvantages as to using flange bolts and nuts in order to eliminate the need for washers?

    What finish will hold paint and be less prone to rust?
     
  2. Jun 12, 2018
    Steve's 70-5

    Steve's 70-5 Active Member

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  3. Jun 12, 2018
    CJ Joe

    CJ Joe Truckhaven Tough!

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    I use, and like, 3/8-16 serrated flange bolts and nuts, zinc finish, likely because I had access to huge quantities. No need for flat washers or lock washers. After several months the zinc is ripe for painting. But I will admit that I used 7/16 NF carriage bolts when I reworked the rear bed mounts. I like the round head in the bed for obvious reasons. Honestly can't remember (as with lots of things) why 7/16" diameter, but no doubt there was a good reason.
     
  4. Jun 12, 2018
    OldAdobe

    OldAdobe Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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  5. Jun 13, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    Joe, when you used the carriage bolts how did you keep the bolt from spinning in a round hole?
     
  6. Jun 13, 2018
    CJ Joe

    CJ Joe Truckhaven Tough!

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    If I recall correctly I filed the hole square.
     
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  7. Jun 13, 2018
    Daryl

    Daryl Sponsor

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    Impact will zip them down. Probably won't ever take it back off right?
     
  8. Jun 13, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    Or possibly tack weld the nut to the bottom of the frame? Or would that be setting up for failure?
     
  9. Jun 13, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    I like the filing the hole square idea. ;)(y)
     
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  10. Jun 13, 2018
    Daryl

    Daryl Sponsor

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    I have done this several times. You end up using 1/2" bolts and the floor is so thin that it still doesn't hold when you go to remove it. I have been able to remove them very easily by welding a nut onto the top of the carriage bolt though.
     
  11. Jun 13, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    Just thought it through. This was pretty stupid. :oops:
     
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  12. Jun 13, 2018
    Glenn

    Glenn Kinda grumpy old man Staff Member

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    :lol: One of them "I hope nobody saw that" moments.
     
  13. Jun 14, 2018
    Keys5a

    Keys5a Sponsor

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  14. Jun 14, 2018
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Why is it stupid? Im asking for a friend.:D
     
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  15. Jun 14, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    With a carriage bolt you have to tighten it with the nut. It ha a rounded head so there's nothing to grab with a wrench.
     
  16. Jun 14, 2018
    Daryl

    Daryl Sponsor

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    That is the reason for filing the hole square so that the bolt has something to grab on. Under the dome of a carriage bolt hides a square.
     
  17. Jun 14, 2018
    jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Oh I thought you were saying it's a stupid idea to weld a nut to the frame to put the bolts through. I did not understand the carriage bolts and the welded nuts part
     
    Last edited: Jun 14, 2018
  18. Jun 14, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    IIRC my Jeeps have had plain hex bolts with fender washers through the floor, everywhere the bolt head contacts the steel floor. Some locations go through the heavier gauge channels, and have ordinary flat washers. Not sure why you need anything fancier than this. It may be different for a M38A1 tub though.
     
  19. Jun 14, 2018
    oldtime

    oldtime oldtime

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    I prefer to use 5/16 and 3/8" carriage bolts.
    Basic grade 2 allows you to break them off after they have rusted and seized through the years.
     
  20. Jun 14, 2018
    Don X

    Don X The Prodigal Moderator Staff Member 2023 Sponsor

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    Tim, the carriage bolts, having rounded heads, could climate snagging, etc. if used within the seating area that might occur with a hex head.

    Daryl, I know. That's why my nut welded underneath was stoopid.
     
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