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

[Mattias Kessén]

> Also, it is harder to 
> start a threaded rod or bolt that has been cut because you do not have the 
> start section.

But if you do that have a nut on the rod that you can twist over the cut area to make it easier to use.

/Mattias

----- Ursprungligt meddelande ----- 
Från: "Grant Brians" <gbrians at hollinet.com>
Till: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Skickat: den 8 maj 2005 21:39
Ämne: Re: [AT] Nuts n Bolts, bolts mostly...


> 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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