Actually, ARP specifically states that nuts and bolts should be lubed prior
to torquing so that the friction between the nut and bold does not distort
the torque numbers.
At the end of the day, the best way to measure bolt stress is using a
"stretch" technique as it bypasses the friction issue.
Paul
-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Mark LaPierre
Sent: Friday, December 05, 2008 5:40 PM
To: BJ8Healeys; healeys@autox.team.net
Subject: Re: [Healeys] Speaking of bolts and stuff
Hmmm, makes me wonder if our heads should be torque dry or lubed? I have
never
intentionally dried my nuts or studs off before torquing. I would bet they
are more lubed
than dry in this area. oops!!!
Off with my head,
Mark
----- Original Message -----
From: "BJ8Healeys" <sbyers@ec.rr.com>
To: <healeys@autox.team.net>
Sent: Friday, December 05, 2008 5:00 PM
Subject: Re: [Healeys] Speaking of bolts and stuff
> Gary, what is really important in a torqued fastener is the tension
> produced
> in the fastener by the torquing process. Normally nut torque is specified
> for "dry" threads. If a fastener is lubricated and then torqued to a
> "dry" specification, it can be overtorqued even to the point of failure
> because there is less friction between the lubricated threads to resist
> the
> torquing process. That is, the tension produced in the fastener will be
> higher at the point where the specified torque is reached on the torque
> wrench.
>
> If a torque is specified for lubricated threads, it will be stated as
> such.
>
> Steve Byers
> HBJ8L/36666
> BJ8 Registry
> Havelock, NC USA
>
>
>
> -----Original Message-----
> From: healeys-bounces@autox.team.net
> [mailto:healeys-bounces@autox.team.net]
> On Behalf Of Editorgary@aol.com
> Sent: Friday, December 05, 2008 4:33 PM
> To: healeys@autox.team.net
> Subject: [Healeys] Speaking of bolts and stuff
>
> On another site I frequent, regarding modern Mercedes, someone last week
> recommended that folks should use anti-seize on lug bolts. Seems to me I
> recall
> that this is not a good idea on any bolt that needs to be tightened to a
> specific torque spec. Can someone who is more knowledgable enlighten me on
> this?
> Thanks
> Gary
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