[AT] Nuts n Bolts, bolts mostly...

[Grant Brians]

Another reason not to thread all of the way on longer bots and then cut them 
to size is heat. When you cut a bolt or threaded rod, the heat from the 
cutting process weakens the metal around the cut area. Also, it is harder to 
start a threaded rod or bolt that has been cut because you do not have the 
start section.
        Grant Brians
----- Original Message ----- 
From: "Steve W." <falcon at telenet.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, May 08, 2005 5:55 AM
Subject: Re: [AT] Nuts n Bolts, bolts mostly...


> Matthew,
>  There are a lot of reasons why this isn't done. Here are a couple to
> get started.
>
> 1- Strength,  Threads weaken a bolt. The root diameter of a thread and
> the sharp corner there are the weakest part of the bolt. Since bolts are
> sized for loads in both shear and tension it would require a larger bolt
> to maintain the same strength.
>
> 2- Hole sizing, Holes are sized for the shoulder diameter of a given
> bolt. Not for the size of the threads. That shoulder bears the load in
> shear and centers the bolt in tension. This gives even clamping force
> around the head.
>
> 3- Threads wear, In a given size hole if thread surface is used as a
> load bearing surface it wears quickly and you end up with a loose part,
> wallowed out holes, or both.
>
> Steve Williams
>
> ----- Original Message ----- 
> From: "Matthew" <matthewx at dogod.com>
> To: <at at lists.antique-tractor.com>
> Sent: Sunday, May 08, 2005 7:30 AM
> Subject: [AT] Nuts n Bolts, bolts mostly...
>
>
>> Not too unusual, I had a bolt rattle out of mu Case yesterday.  It was
> not
>> a size I had on hand so it was off to ag-trac.  After three trips I
> had a
>> workable solution.
>>
>> Now when I say it was not a size that I have on hand, I mean a length,
>> I had bolts with the right diameter and thread pitch.  This got me to
>> thinking, why (short of it is less expensive) don't they thread bolts
>> all te way down to the head on larger sizes?  Heck, if they did that
>> I could go down and for $2.75 a pound or what ave you pick up a bunch
>> of bolts from 1/4" to 1" that are 6" long and be done with it.  I am
>> sure it would hurtmy scottish side to cut a a 1" diameter bolt that is
>> 6" long down to 1" long, but once you factor in gas and what not I am
>> pretty sure you would still come out ahead.  And I suspect my creative
>> side would find a use for the 5" hunk of threaded rod left over.
>>
>> So, what is so bad about bolts being threaded all the way to the head?
>>
>> --Matthew
>>
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