Ubolt nuts???
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Ubolt nuts???
I've searched my **** off and not found the answer. It seems obvious, but I'll put it to you guys. I'm getting ready to put on new x-codes. Ordered everything yesterday, but did not order ubolt nuts. Question is, new nuts or not?
Cargo Master
Joined: Sep 2007
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From: OR and UT
Everyone says to replace the U-bolts because they are Torque to Yield or something fancy like that. As far as I know, nuts are nuts so it doesn't matter. However, I believe the factory thread pitch is different (metric?) so the old nuts probably won't work on new U-bolts unless they are all from Ford. Out of curiosity, where are you getting U-bolts that don't include nuts?
Cargo Master
Joined: Sep 2007
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From: OR and UT
I should have guessed that Ford would not include nuts. I guess that means that they think you don't need to replace them either. 
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You are kinder than I. My experience says they think you need to buy all seperatly for more $.
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Cargo Master
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You could always ask the parts guy to throw 'em in for free.
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From: Shuswap
The U-bolt nuts are not TTY, there's no mating surface contact which would necessitate it. Just torque to whatever spec they give and re-check a couple of times after putting a few miles on...I check after a test drive, then again a few days later to make sure they are tight.
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The U-bolt nuts are not TTY, there's no mating surface contact which would necessitate it. Just torque to whatever spec they give and re-check a couple of times after putting a few miles on...I check after a test drive, then again a few days later to make sure they are tight.
Cargo Master
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From: OR and UT
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Just for conversation, I've delt with several TTY applications in my farm equipment over the years, but never in a nut and bolt application. Head bolts come to mind as the most common application. Whats with TTY bolts on an axle?
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From: Colorado
My two cents--
Fastener elongation generates a compressive load on the nut threads which can cause thread deformation. Thus, the reused nut will likely require an increased torque value to reach the clamp load needed.
Additionally, nut threads will conform to the shape of the bolt threads when tightened. Reuse with a new bolt would no longer give a thread match. Friction won't be the same if the old nut is used with the new bolts and installation torque will be altered.
Fastener elongation generates a compressive load on the nut threads which can cause thread deformation. Thus, the reused nut will likely require an increased torque value to reach the clamp load needed.
Additionally, nut threads will conform to the shape of the bolt threads when tightened. Reuse with a new bolt would no longer give a thread match. Friction won't be the same if the old nut is used with the new bolts and installation torque will be altered.
Cargo Master
Joined: Sep 2007
Posts: 2,624
Likes: 7
From: OR and UT
My two cents--
Fastener elongation generates a compressive load on the nut threads which can cause thread deformation. Thus, the reused nut will likely require an increased torque value to reach the clamp load needed.
Additionally, nut threads will conform to the shape of the bolt threads when tightened. Reuse with a new bolt would no longer give a thread match. Friction won't be the same if the old nut is used with the new bolts and installation torque will be altered.
Fastener elongation generates a compressive load on the nut threads which can cause thread deformation. Thus, the reused nut will likely require an increased torque value to reach the clamp load needed.
Additionally, nut threads will conform to the shape of the bolt threads when tightened. Reuse with a new bolt would no longer give a thread match. Friction won't be the same if the old nut is used with the new bolts and installation torque will be altered.
How appropriate that you would have a quote from Einstein in your signature.