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Bolts?

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Don X, Jun 12, 2018 at 1:28 PM.

  1. Jun 12, 2018 at 1:28 PM
    Don X

    Don X Prodigal Moderator Staff Member 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 at 9:06 PM
    Steve's 70-5

    Steve's 70-5 Member

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  3. Jun 12, 2018 at 9:39 PM
    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 at 10:43 PM
    OldAdobe

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  5. Jun 13, 2018 at 10:07 AM
    Don X

    Don X Prodigal Moderator Staff Member 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 at 11:14 AM
    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 at 12:59 PM
    Daryl

    Daryl Sponsor Sponsor

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    Impact will zip them down. Probably won't ever take it back off right?
     
  8. Jun 13, 2018 at 1:28 PM
    Don X

    Don X Prodigal Moderator Staff Member 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 at 1:48 PM
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    I like the filing the hole square idea. ;)(y)
     
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  10. Jun 13, 2018 at 1:53 PM
    Daryl

    Daryl Sponsor 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 at 2:05 PM
    Don X

    Don X Prodigal Moderator Staff Member Sponsor

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    Just thought it through. This was pretty stupid. :oops:
     
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  12. Jun 13, 2018 at 6:57 PM
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

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    :lol: One of them "I hope nobody saw that" moments.
     
  13. Jun 14, 2018 at 8:42 AM
    Keys5a

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  14. Jun 14, 2018 at 10:13 AM
    jeepstar

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    Why is it stupid? Im asking for a friend.:D
     
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  15. Jun 14, 2018 at 10:16 AM
    Don X

    Don X Prodigal Moderator Staff Member 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 at 10:20 AM
    Daryl

    Daryl Sponsor 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 at 10:35 AM
    jeepstar

    jeepstar Member

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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 at 11:03 AM
  18. Jun 14, 2018 at 11:06 AM
    timgr

    timgr Jeepin' Nerd 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 at 11:26 AM
    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 at 12:27 PM
    Don X

    Don X Prodigal Moderator Staff Member 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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