Stainless nuts bolts in Aluminum boat

[billw]

Not to completely re-direct the thread; but I had been thinking of posting the question, "What, exactly, causes galling of stainless threads?" I KNOW the result all too well; and I KNOW how to AVOID it. What I want to know WHY it happens. (Please don’t tell me because there is no grease; I get that already.) It seems to basically weld itself, with virtually no heat, to speak of. How in tarnation is that possible?

Long live American manufacturing!

[crosbyman]

never had trouble with SS but I think beer and wine are corroding my liver 🙂

Joining AOMCI has priviledges 🙂

[Mumbles]

quote BillW:

“What, exactly, causes galling of stainless threads?”

According to Wiki, it’s all about the crystals.

https://en.wikipedia.org/wiki/Galling

[wiscoboater]

Stainless fasteners are what the major aluminum boat manufactures use. If it’s good enough for Lund and Starcraft, it should work fine on your boat as well.

[mr-asa]

quote BillW:

Not to completely re-direct the thread; but I had been thinking of posting the question, “What, exactly, causes galling of stainless threads?” I KNOW the result all too well; and I KNOW how to AVOID it. What I want to know WHY it happens. (Please don’t tell me because there is no grease; I get that already.) It seems to basically weld itself, with virtually no heat, to speak of. How in tarnation is that possible?

Here’s a NASA paper about it (and a couple other fastener oriented things)
http://ntrs.nasa.gov/archive/nasa/casi. … 009424.pdf

[billw]

Yikes, there is information-overload in the NASA paper (as a lowly knuckle dragger like myself would have expected)….and I didn’t see a word about galling, other than a certain bolt treatment during manufacture helps reduce it.

Long live American manufacturing!

[Author]

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