[Healeys] SS bolt source
healey.nut at gmail.com
Fri Dec 5 07:12:04 MST 2008
"Brittleness in bolts is defined as failure at stresses apparently below the
strength of the bolt material with little or no evidence of plastic
deformation. Typically, fasteners are not brittle below 180 ksi ultimate
tensile strength. Grade 5's have an ultimate tensile strength of 120 ksi and
a grade 8 fastener has an ultimate tensile strength of 150 ksi. This is why
brittle is a relative term. Nearly all fasteners are considered ductile
except some made from PH 15-6 Mo, 17-4 PH and 17-7 PH. "
Generally you can't go wrong with a grade 8, unless it's made in China of
On Fri, Dec 5, 2008 at 9:30 PM, Rich C <richchrysler at quickclic.net> wrote:
> Okay, I'll rise like a trout to the bait....
> I was under the impression that Grade 5 is the normally accepted
> "automotive grade" of fastener, and is adequate for suspension etc.
> Meanwhile Grade 8 is stronger, and is accpted as "aircraft grade". I am not
> referring to anything here having to do with stainless. Stainless is pretty
> but was never used on our cars as far as I'm aware.
> Rich Chrysler
> ----- Original Message ----- From: "gilbert gauthier" <
> comkanuk at cgocable.ca>
> To: "Mark LaPierre" <lapierrem at sbcglobal.net>; "HEALEY MAIL" <
> healeys at autox.team.net>
> Sent: Friday, December 05, 2008 7:36 AM
> Subject: Re: [Healeys] SS bolt source
> And then Ed' shop what are you suggesting as a good replacement ?
>> Le 08-12-05 ` 06:57, Mark LaPierre a icrit :
>> """Oh Lord have mercy. Here we go again.""""
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