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Author:
Date:
Subject:
DerbyDad03
2008-06-30 12:40:19
OT - Torque the Nut or the Bolt?
This question came up while working on a project this weekend and I'm
looking for some input.
Let's say I've got a nut and bolt holding something together and I
want it torqued at XXX inch-pounds. I can hold the nut with a standard
wrench and use the torque wrench on the bolt, or I can hold the bolt
with a standard wrench and use the torque wrench on the nut.
One of the guys I was working with said "When given the chance, you
always torque the nut." When I asked why the answer was "Because
that's what I've always been told." You know how *those* conversations
go!
So what's the deal? Does it matter? And if so, why? Could it be
different in different cases? And if so, why?
Thanks!
Author:
Date:
Subject:
Oren
2008-06-30 12:49:11
Re: OT - Torque the Nut or the Bolt?
On Mon, 30 Jun 2008 12:40:19 -0700 (PDT), DerbyDad03
<[email protected]> wrote:
>This question came up while working on a project this weekend and I'm
>looking for some input.
>
>Let's say I've got a nut and bolt holding something together and I
>want it torqued at XXX inch-pounds. I can hold the nut with a standard
>wrench and use the torque wrench on the bolt, or I can hold the bolt
>with a standard wrench and use the torque wrench on the nut.
>
>One of the guys I was working with said "When given the chance, you
>always torque the nut." When I asked why the answer was "Because
>that's what I've always been told." You know how *those* conversations
>go!
>
>So what's the deal? Does it matter? And if so, why? Could it be
>different in different cases? And if so, why?
>
>Thanks!
I follow the reference manual. Either torque the bolt or the nut. When
a pattern of torque is necessary, like with head bolts..follow the
instructions.
I replaced my radial arm bushings on the truck. The ONLY option was to
torque the nut.
Author:
Date:
Subject:
DerbyDad03
2008-06-30 17:04:46
Re: OT - Torque the Nut or the Bolt?
On Jun 30, 3:49 pm, Oren <O...@127.0.0.1> wrote:
> On Mon, 30 Jun 2008 12:40:19 -0700 (PDT), DerbyDad03
>
>
>
>
>
> <[email protected]> wrote:
> >This question came up while working on a project this weekend and I'm
> >looking for some input.
>
> >Let's say I've got a nut and bolt holding something together and I
> >want it torqued at XXX inch-pounds. I can hold the nut with a standard
> >wrench and use the torque wrench on the bolt, or I can hold the bolt
> >with a standard wrench and use the torque wrench on the nut.
>
> >One of the guys I was working with said "When given the chance, you
> >always torque the nut." When I asked why the answer was "Because
> >that's what I've always been told." You know how *those* conversations
> >go!
>
> >So what's the deal? Does it matter? And if so, why? Could it be
> >different in different cases? And if so, why?
>
> >Thanks!
>
> I follow the reference manual. Either torque the bolt or the nut. When
> a pattern of torque is necessary, like with head bolts..follow the
> instructions.
>
> I replaced my radial arm bushings on the truck. The ONLY option was to
> torque the nut.- Hide quoted text -
>
> - Show quoted text -
Not everything comes with a manual. This is a custom built project.
Author:
Date:
Subject:
dpb
2008-06-30 19:03:49
Re: OT - Torque the Nut or the Bolt?
DerbyDad03 wrote:
...
> Not everything comes with a manual. This is a custom built project.
Then you get to set the torque specs... :)
--
Author:
Date:
Subject:
dpb
2008-06-30 14:49:16
Re: OT - Torque the Nut or the Bolt?
DerbyDad03 wrote:
> This question came up while working on a project this weekend and I'm
> looking for some input.
>
> Let's say I've got a nut and bolt holding something together and I
> want it torqued at XXX inch-pounds. I can hold the nut with a standard
> wrench and use the torque wrench on the bolt, or I can hold the bolt
> with a standard wrench and use the torque wrench on the nut.
>
> One of the guys I was working with said "When given the chance, you
> always torque the nut." When I asked why the answer was "Because
> that's what I've always been told." You know how *those* conversations
> go!
>
> So what's the deal? Does it matter? And if so, why? Could it be
> different in different cases? And if so, why?
The "guy" is right because the torque spec will be for the fastener. If
turn from the bolt side instead of the nut, there's a possibility
there's additional friction (almost guaranteed) along the side of the
bolt that isn't there on the nut side. Consequently, one will end up
low on the torque spec; how much depends on the unknown internal force
having to overcome w/ the bolt itself.
--
Author:
Date:
Subject:
mike
2008-06-30 13:09:23
Re: OT - Torque the Nut or the Bolt?
On Jun 30, 12:40 pm, DerbyDad03 <[email protected]> wrote:
> This question came up while working on a project this weekend and I'm
> looking for some input.
>
> Let's say I've got a nut and bolt holding something together and I
> want it torqued at XXX inch-pounds. I can hold the nut with a standard
> wrench and use the torque wrench on the bolt, or I can hold the bolt
> with a standard wrench and use the torque wrench on the nut.
>
> One of the guys I was working with said "When given the chance, you
> always torque the nut." When I asked why the answer was "Because
> that's what I've always been told." You know how *those* conversations
> go!
>
> So what's the deal? Does it matter? And if so, why? Could it be
> different in different cases? And if so, why?
>
> Thanks!
It does not matter. The braking effect of the underside of the nut is
equivalent to the braking effect of the underside of the bolt head.
Author:
Date:
Subject:
DerbyDad03
2008-06-30 13:58:22
Re: OT - Torque the Nut or the Bolt?
On Jun 30, 4:09 pm, mike <[email protected]> wrote:
> On Jun 30, 12:40 pm, DerbyDad03 <[email protected]> wrote:
>
>
>
>
>
> > This question came up while working on a project this weekend and I'm
> > looking for some input.
>
> > Let's say I've got a nut and bolt holding something together and I
> > want it torqued at XXX inch-pounds. I can hold the nut with a standard
> > wrench and use the torque wrench on the bolt, or I can hold the bolt
> > with a standard wrench and use the torque wrench on the nut.
>
> > One of the guys I was working with said "When given the chance, you
> > always torque the nut." When I asked why the answer was "Because
> > that's what I've always been told." You know how *those* conversations
> > go!
>
> > So what's the deal? Does it matter? And if so, why? Could it be
> > different in different cases? And if so, why?
>
> > Thanks!
>
re: It does not matter. The braking effect of the underside of the
nut is equivalent to the braking effect of the underside of the bolt
head
Even if the material on the underside of the nut is not equivalent to
the material on the underside of the bolt head?
Author:
Date:
Subject:
dpb
2008-06-30 16:02:50
Re: OT - Torque the Nut or the Bolt?
DerbyDad03 wrote:
> On Jun 30, 4:09 pm, mike <[email protected]> wrote:
>> On Jun 30, 12:40 pm, DerbyDad03 <[email protected]> wrote:
>>
>>
>>
>>
>>
>>> This question came up while working on a project this weekend and I'm
>>> looking for some input.
>>> Let's say I've got a nut and bolt holding something together and I
>>> want it torqued at XXX inch-pounds. I can hold the nut with a standard
>>> wrench and use the torque wrench on the bolt, or I can hold the bolt
>>> with a standard wrench and use the torque wrench on the nut.
>>> One of the guys I was working with said "When given the chance, you
>>> always torque the nut." When I asked why the answer was "Because
>>> that's what I've always been told." You know how *those* conversations
>>> go!
>>> So what's the deal? Does it matter? And if so, why? Could it be
>>> different in different cases? And if so, why?
>>> Thanks!
> re: It does not matter. The braking effect of the underside of the
> nut is equivalent to the braking effect of the underside of the bolt
> head
>
> Even if the material on the underside of the nut is not equivalent to
> the material on the underside of the bolt head?
Not normally as quite often there will be lock washer under the nut not
under the head and, as noted above, there's drag along the length of the
fastener for the bolt that isn't present for the nut. This effect
varies from insignificant to possibly quite large depending on the
application and size of bolt/hole/what the bolt is bearing on, if anything.
--
Author:
Date:
Subject:
mike
2008-06-30 14:35:57
Re: OT - Torque the Nut or the Bolt?
On Jun 30, 1:58 pm, DerbyDad03 <[email protected]> wrote:
> On Jun 30, 4:09 pm, mike <[email protected]> wrote:
>
>
>
> > On Jun 30, 12:40 pm, DerbyDad03 <[email protected]> wrote:
>
> > > This question came up while working on a project this weekend and I'm
> > > looking for some input.
>
> > > Let's say I've got a nut and bolt holding something together and I
> > > want it torqued at XXX inch-pounds. I can hold the nut with a standard
> > > wrench and use the torque wrench on the bolt, or I can hold the bolt
> > > with a standard wrench and use the torque wrench on the nut.
>
> > > One of the guys I was working with said "When given the chance, you
> > > always torque the nut." When I asked why the answer was "Because
> > > that's what I've always been told." You know how *those* conversations
> > > go!
>
> > > So what's the deal? Does it matter? And if so, why? Could it be
> > > different in different cases? And if so, why?
>
> > > Thanks!
>
> re: It does not matter. The braking effect of the underside of the
> nut is equivalent to the braking effect of the underside of the bolt
> head
>
> Even if the material on the underside of the nut is not equivalent to
> the material on the underside of the bolt head?- Hide quoted text -
>
> - Show quoted text -
In such a case the difference would still likely be minimal. It's not
like you're going to use an aluminum nut with steel bolt.
Torque specs vary on bolt size, bolt strength, application
(permanent, non-permanent, etc.) and lubrication or lack thereof.
They don't vary on which half of the fastener is experiencing sliding
friction.
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