SyKaTurbo
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| posted on 26/9/07 at 09:43 AM |
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suspension bolts
i have been trying to get some bolts locally but cant get 8.8 grade in stainless steel (only in zinc). does anyone have some details of a supplier or
details of what you used?
cheers
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BenB
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| posted on 26/9/07 at 09:44 AM |
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Namrick are pretty good for stuff like this (though P+P can be quite expensive)....
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ned
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| posted on 26/9/07 at 09:44 AM |
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grade of bolts in stainless is different to normal steel. someone will be along soon who knows the equivalent specs...
Ned.
beware, I've got yellow skin
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BenB
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| posted on 26/9/07 at 09:47 AM |
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You get A2 and A4 grade..... Not sure how that compares to 8.8 or 12.9
bear in mind stainless is intrinsically weaker than normal bolts- are stainless suspension bolts a good idea???
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iank
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| posted on 26/9/07 at 09:48 AM |
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A4-80 is as close as you can get to 8.8
Table here -> http://home.jtan.com/~joe/KIAT/kiat_2.htm
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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SyKaTurbo
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| posted on 26/9/07 at 09:52 AM |
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how does using the weaker stainless affect the sva?
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jimgiblett
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| posted on 26/9/07 at 09:57 AM |
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quote:
Originally posted by SyKaTurbo
how does using the weaker stainless affect the sva?
You crash on the way to the centre as something falls of your car.
Serously though if it is meant to be 8.8 fit 8.8.
- Jim
[Edited on 26/9/07 by jimgiblett]
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BenB
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| posted on 26/9/07 at 10:03 AM |
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Anyway, if you use copper slip when installing the bushes etc the bolts tend to get that covered in the stuff they'll never go rusty 
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rayward
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| posted on 26/9/07 at 10:04 AM |
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I wouldn;t use Stainless of any grade for suspension components, it has been covered a few times, maybe try a search on here?.
Ray
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Duncan_P
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| posted on 26/9/07 at 12:08 PM |
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Lots of places were suggested when i was looking for some different bolts in this thread
linky
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another_dom
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| posted on 26/9/07 at 02:18 PM |
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Never ever ever use stainless in highly stressed applications - it really is that simple!
Dom.
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TimC
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| posted on 26/9/07 at 05:42 PM |
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Titanium on the other hand....
You'd need to rob a bank though... I'm sure a member on here told me that he knew a guy who'd spent £2.5k on bolts for his Dax!
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afj
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| posted on 26/9/07 at 06:21 PM |
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i spent 600 on ti bolts for my Z750
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indykid
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| posted on 26/9/07 at 06:47 PM |
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can't remember who said it, but it's been mentioned recently.
a wishbone is fastened onto the chassis by a strip of 3mm steel, itself fastened to a 1.6mm wall of RHS. sort of puts it into perspective really.
M12 bolts are massively over-specced. i imagine they're used by all the kit manufacturers now as that's what they can get crush tubes for
polybushes in. the original locost design used smaller bolts for the herald metallastic bushes, so a larger dia bolt of lower spec is surely up to the
job.
or i may be wrong.....but i'd happily use A4 stainless M12 bolts.
tom
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kb58
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| posted on 26/9/07 at 08:04 PM |
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But keep in mind these oversize M12 bolts are there as pivots for M12 rod-ends. While smaller rod-ends are technically strong enough, they wear out
very quickly. This is what oversized rod-ends buy you, long life, hence the need for the large bolts.
I suppose you could use small bolts and make spacers for the large rod-ends, but hardly anyone bothers. We're building toys, no F1 cars.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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David Jenkins
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| posted on 26/9/07 at 08:07 PM |
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quote:
Originally posted by indykid
can't remember who said it, but it's been mentioned recently.
'twas I.
quote:
a wishbone is fastened onto the chassis by a strip of 3mm steel, itself fastened to a 1.6mm wall of RHS. sort of puts it into perspective really.
Saying that, I still used aircraft-grade bolts in my suspension... 
David
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Syd Bridge
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| posted on 27/9/07 at 02:07 PM |
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quote:
Originally posted by another_dom
Never ever ever use stainless in highly stressed applications - it really is that simple!
Dom.
You better go tell that to the oil and chemical industries!!!! Particularly the deep sea oil industry. When is the uninformed bs on this list going
to stop???? If ever.
There ARE high tensile stainless bolts available. Rare and twice the price of others, but available nonetheless.
Cheers,
Syd.
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David Jenkins
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| posted on 27/9/07 at 02:17 PM |
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But if you're talking about the general-purpose stainless nuts and bolts of dubious origin that us mere mortals can get our hands on...
...best left alone for any sort of critical job, IMHO.
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another_dom
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| posted on 28/9/07 at 12:41 PM |
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Admittedly I have never worked in the oil or chemical industries, though I was a systems engineer at a nuclear power plant for a while! I now work in
aviation so consider myself fairly up to speed on fastener design and use. Whilst it is true that there are high grade stainless steels available,
they are not best suited for use in highly stressed double shear installations (ie suspension bolts). I certainly would not use the commonly
available A2 or A4 grade bolts. No BS 
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Syd Bridge
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| posted on 28/9/07 at 03:38 PM |
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A bolt is only as stressed as the designer wants it to be.
You could use aluminium bolts, if you sized them properly, as any engineer would be able to tell anyone taking an interest.
A 6mm 8.8 bolt will be far less useable than an 8mm A4 in the same application on dry land,....but put them both in salt water and see what
happens.
Cheers,
Syd.
[Edited on 28/9/07 by Syd Bridge]
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designer
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| posted on 28/9/07 at 06:11 PM |
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I don't think you can get 8.8 grade bolts in stainless.
never use stainless bolts in stressed areas anyway.
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Syd Bridge
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| posted on 28/9/07 at 06:53 PM |
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quote:
Originally posted by designer
I don't think you can get 8.8 grade bolts in stainless.
I can go one better than that. I know you can't get ss
bolts in 8.8.
As a 'designer', you should know that also. Then again, maybe dress designers wouldn't. You don't say what sort of
'designer' you profess to be.
[never use stainless bolts in stressed areas anyway.]Please see posts above re industries using SS bolts in stressed areas.
And what does tightening a bolt do? Stresses the bolt!!!!! The very nature of a bolt indicates stresses in the vicinity.
I had a discussion a year or two back, regarding round black rubber bushes with a steel tube through the inside. A couple of dear gents on here
couldn't accept that they were anything you wanted them to be, and not just 'metallastic bushes'.
I will not revisit that scenario again.
You either understand, ....or you don't.
Cheers,
Syd. 
[Edited on 28/9/07 by Syd Bridge]
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David Jenkins
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| posted on 28/9/07 at 06:59 PM |
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<snotty post removed>
UPDATE: Syd and I have exchanged polite U2Us - honestly - so this post has been revised...
[Edited on 28/9/07 by David Jenkins]
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Syd Bridge
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| posted on 28/9/07 at 07:17 PM |
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Nope, no more!
Someone will end up, calling me names, I'll ask where they bought their qualifications, they'll call me an uppity twat or something worse,
and I'll tell them to go register at the local college for engineering classes. Then some scotsman will come along and really upset the wagon!!
No, best avoided by stopping things right here. Sorry, you didn't pay for the full argument.
To change the subject, I had a Ca?er?am R260 in my drive yesterday for a while. Not a bad looking piece of kit, but what is that weird oil system all
about? Anyone know just how that dry sump system is meant to operate?
Cheers,
Syd.
[Edited on 28/9/07 by Syd Bridge]
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David Jenkins
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| posted on 28/9/07 at 07:26 PM |
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...and stop trying to change the argument!
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