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Automotive use of Stainless Steel Fasteners in Aluminum Block




Hi

I am building a small sports car in my spare time and want to know if I can safely use stainless steel bolts to bolt the gearbox etc to the aluminium block.

I realise that this is not an industrial related topic, however, I hope that you will help me as I haven't been able to find any other source to get a definitive answer.

Thanks in anticipation.

John Ewins
- Auckland, New Zealand
November 6, 2008



Hi, John. Everything is a matter of degree. I wouldn't use stainless fasteners on an aluminum aircraft skin, but I think you'll be good. Although there is a strong difference in electrochemical potential between aluminum and stainless, there seems to be a lot of evidence that (perhaps due to the passive skin on both), it works pretty well in the real world.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
November 6, 2008




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