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post #5 of Old 12-06-2012
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Re: Prop shaft material

I would never recommend any stainless grade for application under water. Obviously I will recommend titanium instead of things like aquamet or bronze, but they would certainly be preferable to stainless.

The issue with stainless is that it has different galvanic potential in and out of the water. So a stainless shaft actually galvanically attacks itself (this is what shaft zincs are for).

Greg Rubin
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