Stainless steel??

When replacing all underbody bolts with new, which are the bolts NOT to be replaced by Stainless steel?

I have heard a few horror story's of nuts and bolts working themselves free as they don't have the same 'bite' as mild steel. Also of them actually shearing off as they are much more brittle,



thanks

 

To be honest I wouldn't replacing any bolt from the underside that has to do with suspension, transmition and beam mountings...

 

It's nothing to do with bolts "biting", it is to do with ductility, bendiness in normal language.
SS is a far stronger material than mild steel, but it is also much much more brittle so would break instead of bend.
You will be perfectly safe with all the underbody bolts, I would just steer clear of things subject to loads of high frequency vibration like brakes.
tabetha

 

ive changed most of mine on the underside.. not had any problems... not done driveshaft or prop bolts .. or the big main beam ones..

 

stainless is up to 80% LESS tensile than a regular 8.8 bolt; or so this was my conclusion when doing some research after looking around for 10.9 rated bolts for my subframe.

 

As said above.....lot's of different views

I'm wondering how long a normal bzp bolt would last before corrosion set in again......

 

pack it with grease?

 

Naa....I would like it to presentable when complete as to maybe use chocks and a mirror at the shows...

 

hmm wipe the excess off lol

 

id just use standard zinc plated bolts myself yes they dont look as good but i wouldnt risk using stainless ones for the fact they can break in use but can also break when being undone causing all sorts of headaches when trying to dismantle something as they are very difficult to drill out

 

The use of mild steel is perfectly ok for this use, typically having 0.05% - 0.15% carbon, a low carbon steel could be used also slightly softer but more ductile, has 0.16% - 0.29% carbon content as it's main alloying constituent, mild can also be carburized where needed for extra hardness, low carbon steels can also develop luder bands, these are like a elastic stretch it a certain amount and it will stretch, too much and it will break, shoudln't be stretched at all as weakens them, leading to deformation called luder bands.
So in short mild is better, anything over 2% carbon by the way is considered as cast!!
I am referring to everday obtainable metals as ther eis a bewildering array of treatments both hot and cold as well as gas teatments that can produce massively different properties compared to the same untreated materials.
Mild is a safe bolt for this application.
tabetha

 

Does not leave much he can change then tabetha ......

 

I dunno, if he has mudflaps he can change those bolts for stainless at least

 

Don't take it out in the wet, that way they don't rust....

My BZP items were replaced a few years ago and are showing no signs of corrosion yet.

 

mudflaps


See if u can still get gen bolts , sure ford did there homework Found some available so far