Kickn

Kickn

Member
I'm replacing bolts for the back seats just now on my 90.

I remember a comment a little while ago that even Stainless would cause oxidation on aluminum. I thought SS was inert and wouldn't cause an issue but wanted to make sure before I ordered them. My gut would be to replace everything over time with SS.

Any quick advice?
 
stainless weaker then aluminium? They are for the back inward facing seats...not the seat belts - just the seats.

It looked like aluminum in there before - or something not very strong as I snapped a few of them taking them out.
 
Dr_evil said:
stainless are weaker than mild steel, should have been mild steel in there
Click to expand...

Bolts are medium carbon steel not mild steel.

They may have used low grade bolts (maybe 4.6?)... But really ought to have been 8.8 tensile strength. I very much doubt they'd have been aluminium bolts - almost unheard of in automotive situations.

A2 grade stainless fastenings will rust less but as stated are also weaker than carbon steel bolts. A4 grade stainless exhibit a tensile and yield strength very similar to that of 8.8 grade steel bolts.

Your dissimilar metals corrosion problem will remain.

Hth
 
In 35yrs of engineering, I have never seen an aluminium bolt. I dare say they are used for something somewhere. But I've never seen one. What would one be used for? Aircraft Industry perhaps??:confused:

Just googled these. Quite a few uses apparently. As my old dad used to say, Every days a school day.
 
Last edited:
meego said:
In 35yrs of engineering, I have never seen an aluminium bolt. I dare say they are used for something somewhere. But I've never seen one. What would one be used for? Aircraft Industry perhaps??:confused:
Click to expand...


I bet there's some on the moon , been there since 1969
 
meego said:
In 35yrs of engineering, I have never seen an aluminium bolt. I dare say they are used for something somewhere. But I've never seen one. What would one be used for? Aircraft Industry perhaps??:confused:

Just googled these. Quite a few uses apparently. As my old dad used to say, Every days a school day.
Click to expand...

Aero engines and greenhouses too name a few
 
From memory I don't think Zinc & ally react. I'm sure an internet prowler will be on soon to tell me I am wrong.:rolleyes:
 
the_wolf said:
:confused:
Click to expand...

galv bolt on galv plated steel long time before corrosion. Galv on steel shorter time frame. Stainless and galv will corrode also. the environment they are in plays a big part. Salt water speeds things up. A coating on the mating surfaces help slow corrosion down. copper would be a good choice. When in Navy we used white lead as a contact shield to slow corrosion down
 
Thor1950 said:
galv bolt on galv plated steel long time before corrosion. Galv on steel shorter time frame. Stainless and galv will corrode also. the environment they are in plays a big part. Salt water speeds things up. A coating on the mating surfaces help slow corrosion down. copper would be a good choice. When in Navy we used white lead as a contact shield to slow corrosion down
Click to expand...

Copper defo reacts with ally.
 
GalvanicCorrosion.jpg
 
The aircraft industry invented a coating that well slowed this type of corrosion in the 40's. Landrover used something similar on fixtures on series one's and two's[it was a green color]
 
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