Grades Of Steel / Stainless Steel

[mhyphenl 10 1 Cars]

I'm just redoing my rear suspension and I've got a guy who can get me the bolts i need and stainless has been suggested but this statement gives me some concern:

A2-70 stainless steel has a slightly lower tensile strength than standard 8.8 grade plain carbon steel bolts.

Is it still good enough to do the job or not??

[EdCherry 34 1 Cars]

Holding on brackets sure... suspension components no.

[welshpug 1,657]

a quick google using the terms "a2/70 tensile strength"

 

bought up this interesting email from a fasteners supplier to a member on the aprilia forum.

 

http://www.apriliaforum.com/forums/showthread.php?t=145887 scroll down to post #5.

Edited February 13, 2010 by welshpug

[mhyphenl 10 1 Cars]

Holding on brackets sure... suspension components no.

 

Do you know what spec the bolts are on the beam braces etc.

[mhyphenl 10 1 Cars]

Strike my last post then, thats the most you could hope to learn about bolt strength, the way they're labelled etc in one minute. I may well use the standard bolts for the bracing points, but I will look for some A2-80 bolts just to evaluate cost.

[Tom Fenton 1,542]

I doubt you will get stainless bolts with the correct fine pitch to bolt the rear stays to the beam. I would and do use the standard Peugeot versions.

[mhyphenl 10 1 Cars]

I doubt you will get stainless bolts with the correct fine pitch to bolt the rear stays to the beam. I would and do use the standard Peugeot versions.

 

Do you actually use peugeot parts and are they reasonably priced and available. My local Peugeot dealer is crap, they're disinterested in hunting for parts, will only sell in quantity at full price. Lots of guys seem to have good dealers that will sell them what they want if possible and at atleast 10% discount.

[Cameron 16]

You'll have to use a very good anti-seize with stainless bolts too.

[Tom Fenton 1,542]

I usually re use the bolts with a clean, and obtain new nyloc nuts in the right pitch. Or else if needed in a hurry, re use the original nylocs, with some loctite threadlock.

[Tom Fenton 1,542]

You'll have to use a very good anti-seize with stainless bolts too.

 

Definitely. People who rave on about stainless bolts have obviously never had anything of reasonable size gall up solid on them!

[mhyphenl 10 1 Cars]

Definitely. People who rave on about stainless bolts have obviously never had anything of reasonable size gall up solid on them!

 

I.m going with OE spec then! Might get new though as its supposed to be a showroom restore, I don't want to cut corners on the first bit!! What can be used to prevent seizing and rusting as much as poss?

[EdCherry 34 1 Cars]

Copper Grease and keeping things clean.

[Tom Fenton 1,542]

Copper grease is OK, but if you can get hold of it, Aluminium anti seize is better. But either will do.

[Cameron 16]

Definitely. People who rave on about stainless bolts have obviously never had anything of reasonable size gall up solid on them!

 

Yeah it's amazing how tightly they can sieze and how quickly they do it! They pretty much weld themselves in and you haven't a hope in hell of getting it undone.

 

And yes, copper grease isn't enough really. We use Loctite nickel anti-sieze, but that's probably a bit ott.

[SurGie 54]

Titanium nuts & bolts FTMFW

[Tom Fenton 1,542]

Have you ever used any Titanium fasteners? As I have, and they are even worse than stainless for locking up solid. Ti mating with aluminium alloy is just about OK, Ti with Ti is a nightmare.

[welshpug 1,657]

When I worked in a bike shop I experienced what TI can do, when someone had a £2k Ti frame and used a Ti seatpost in it, over the winter.... DOH!

[B1ack_Mi16 67]

I think you want stainless A4 to more or less match the normal 8.8 bolts...

 

Buy anyway the 8.8's are probably a better choice even though they will start rusting after a while.

 

10.9 and 12.9 bolts again are more prone to fatigue, more brittle than the 8.8's.

[shalmaneser 26]

When I worked in a bike shop I experienced what TI can do, when someone had a £2k Ti frame and used a Ti seatpost in it, over the winter.... DOH!

 

Just going to say that, same has happened to me...

 

Not a happy chappy.

[DRTDVL 4 1 Cars]

Buy anyway the 8.8's are probably a better choice even though they will start rusting after a while.

 

Could you paint them with something like Por15?