stainless steel fixings

PostPost by: richard sprint » Mon Jun 21, 2010 10:13 am

I would be interested to know whether what I would term 'screw plates' for example the little items that receive the self tap screws behind the front side lights and used extensively throughout are still available and whether in stainless steel?

As a general question have others fitted stainless steel fasteners nuts/bolts/washers and have there been any negative results like becoming loose or shearing.

Finally the stockists who supply in small numbers in UNC/UNF and the self tap screws?
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PostPost by: GrUmPyBoDgEr » Mon Jun 21, 2010 10:26 am

Give "Namrick" a try, I know that they sell S.St. Fasteners in small quantities.
Due to the way they work, the trim "Nuts" are made from Spring steel sheet, some are Zinc plated which offers a bit of protection from corrosion.
I've never seen any made from S.St.
They are still widely used within the industry & are available in many designs & sizes.
Sorry cannot provide you with a specific source.

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PostPost by: andyelan » Mon Jun 21, 2010 10:38 am

Hi there

Assuming you're in the UK try http://www.namrick.co.uk

As far as the use of stainless steel fasteners goes, while high tensile ones are available, I wouldn't use them on anything critical.

I only ever use high tensile grade S (or better) nuts and bolts, zinc plated ones if appearance is important.

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PostPost by: terryp » Mon Jun 21, 2010 10:44 am

A few on ebay but none in stainless, (They are called Spire Clips)
http://shop.ebay.co.uk/i.html?_nkw=SPIR ... m270.l1313

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PostPost by: lotusfan » Mon Jun 21, 2010 11:45 am

Richard

www.wrightsautosupplies.co.uk and www.bresco.com are worth a look.
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PostPost by: RichardS » Mon Jun 21, 2010 1:09 pm

I've found these suppliers good for small quantities http://www.stagonset.co.uk/ + also worth looking on Ebay and searching for the specific size you need as the postage tends to be cheaper than the bigger suppliers - you can end up spending ?3 on postage for ?1 worth of small items

The other name for the screw fixings is speed nuts - I haven't found any in stainless.

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PostPost by: westfieldfasteners » Mon Jan 17, 2011 9:59 am

RichardS wrote:I've found these suppliers good for small quantities http://www.stagonset.co.uk/ + also worth looking on Ebay and searching for the specific size you need as the postage tends to be cheaper than the bigger suppliers - you can end up spending ?3 on postage for ?1 worth of small items

The other name for the screw fixings is speed nuts - I haven't found any in stainless.

Richard



This link is now dead.

You are welcome to try our new company with the details below.


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PostPost by: spanner » Mon Jan 17, 2011 2:25 pm

Also known as a Tinnerman fastener.... http://www.tinnerman.com/en/company/history.asp

Flat and several U type variations (with aircraft corrosion proofing) here: http://www.aircraftspruce.com/catalog/h ... nerman.php

Note the type B screw needed.

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PostPost by: The Cyclist » Tue Jan 18, 2011 9:28 pm

I decided to use "rivnuts" which are large diameter soft rivets with a screw in the base. They are very neat, but in europe it is difficult to get anything other than metric sizes. They aren't stainless & I have a small concern that I will run into electrolytic corrosion problems in the future.

In the US they will be available in UNF/UNC/ANC I'm sure.

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PostPost by: bcmc33 » Tue Jan 18, 2011 11:26 pm

The Cyclist wrote:I decided to use "rivnuts" which are large diameter soft rivets with a screw in the base. They are very neat, but in europe it is difficult to get anything other than metric sizes. They aren't stainless & I have a small concern that I will run into electrolytic corrosion problems in the future.

I have used rivnuts in many places on my car - please explain how and where electrolytic corrosion can take place.
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PostPost by: UAB807F » Wed Jan 19, 2011 7:32 am

bcmc33 wrote:I have used rivnuts in many places on my car - please explain how and where electrolytic corrosion can take place.

I don't know about these specific rivnuts but I think the poster was referring to corrosion due to direct contact between 2 different metals with an electrolyte (water/salt/etc) present. The rate of corrosion is proportional to the relative areas and the electric potential between the two metals, which of course depends on the metals involved.

Apologies if you're already aware, but metals are generally ranked according to their potentials in something called the Galvanic series http://en.wikipedia.org/wiki/Galvanic_series and to get a decent corrosion rate you generally pick one from the top, one from the bottom. For example, if you had a 316 stainless bolt and used an Aluminium nut, then you'd expect the nut to corrode quite badly. Guessing at the compositions of a rivnut with an aluminium "rivet" with either directly threaded aluminium or a threaded steel insert and using a steel bolt, then you'd expect corrosion at the Al/steel interface.

In practice this might be negligible because there are lots of mitigating factors to influence the rates - surface areas, constant/intermittent presence of electrolyte, simple protection with grease/waxoyl, etc.

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PostPost by: alexblack13 » Wed Jan 19, 2011 8:25 am

And one can get s/s rivnuts too...In Imperial.

I personally don't bother and use metric s/s fasteners where appropriate. DO NOT use where high tensile is required. but where normal around the engine bay etc fasteners are concerned they are fine. And they polish up like chrome.

All the best guys... :wink:

Al' ......
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PostPost by: elansprint71 » Wed Jan 19, 2011 9:02 am

Love the thread drift. :wink:

I can't imagine that Spire clips (of whatever composition) would be used to fasten on anything "critical".

wrt the SS bolts supplied by Namrick, I did some non-scientific testing a while back vs "normal" mild steel items of the same sizes, using a vice and a torque wrench. The SS items are pretty tough! However, as previously posted, if HT bolts are specified, use HT bolts. :)
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PostPost by: bcmc33 » Wed Jan 19, 2011 12:38 pm

The Cyclist wrote:I decided to use "rivnuts" which are large diameter soft rivets with a screw in the base. They are very neat, but in europe it is difficult to get anything other than metric sizes. They aren't stainless & I have a small concern that I will run into electrolytic corrosion problems in the future.

In the US they will be available in UNF/UNC/ANC I'm sure.

Geoff

The thought of using aluminium rivenuts had never crossed my mind. When you do use these with steel screws/bolts always use lithium grease to prevent any reaction.
I use steel/stainless steel rivnuts from http://www.memfast.co.uk/ (no connection).
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PostPost by: GrUmPyBoDgEr » Wed Jan 19, 2011 12:53 pm

Just a thought on the use of Rivnuts.
Alex mentioned in an earlier post about using them on the gearbox cross member; a horrible thing to get at with spanners in situ'.
However that area is right down where corrosion can easily occur (well if you don't have a leaky Twincam)
I was wondering how Rivnuts would stand up in that environment or more precisely what would stop them turning with the bolt if they were corroded together?
Maybe a weld nut would be more appropriate in areas like that?

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