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Stainless Fasteners in Aluminum Plate

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Stainless Fasteners in Aluminum Plate

Old 03-10-2019, 11:52 AM
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Duralac is another isolating paste that works well.
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Old 03-10-2019, 05:37 PM
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Go to aluminumalloyboats.com all alloy all the time! Some builders on site
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Old 03-10-2019, 07:18 PM
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Tefgel or never seize . Been using never seize for yrs as it's cheaper and WORKS!!!
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Old 03-10-2019, 08:22 PM
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Originally Posted by Blazer7420 View Post
Isn't that the point?
Who puts on ant mounts or rigger mounts in a T-Top or steering arms and says "Yup, those are NEVER coming off".
Hey Blazer, can you tell that dummy ParkerMarines that copper never sneeze has copper in it and the non-copper based silver never sneeze doesn’t have copper in it. I don’t even want to get into the differences between 304 and 316 in seawater environments. Thanks Blazer for
taking care of my light work...


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Old 03-11-2019, 03:39 AM
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Dissimilar metals- STL2
Anti seize- moly lube
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Old 03-11-2019, 03:48 AM
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Originally Posted by TheBigWhit View Post

Hey Blazer, can you tell that dummy ParkerMarines that copper never sneeze has copper in it and the non-copper based silver never sneeze doesn’t have copper in it. I don’t even want to get into the differences between 304 and 316 in seawater environments. Thanks Blazer for
taking care of my light work...


Sorry Modman, I got's my hands full, I'm over on the Parker thread trying to convince them fine folk that all boat's ain't created perfect.
They ain't have'n it, calling me crazy and such.
But, since you got me. When is the last time you saw a boat made with ALL 316 SS?
And, do you buy from the 316 bin at WM or MacDonalds?

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Old 03-11-2019, 04:04 AM
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This is what I've been using.
Never-Seez® Blue Moly

https://www.chempoint.com/products/b...seez-blue-moly
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Old 03-11-2019, 04:35 AM
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Lanoline grease is not an old wive’s tail.

I have used it for some years on my alloy boats when installing stainless (316) bolts and screws. Every bit as good as Tef-gel. I try to add nylon washers between the stainless washers or press studs and the hull as well.

A good friend who runs a aluminium marine window manufacturing business put me onto the lanolin grease, it is all he uses. He supplies windows to many major boat builders and for custom yachts, and knows what he is talking about.

Tef-gel does the same job but is a million times more expensive.

Duralac - I used to use that evil stuff many years ago but no more!


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Old 03-11-2019, 10:21 AM
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Originally Posted by Blazer7420 View Post
Sorry Modman, I got's my hands full, I'm over on the Parker thread trying to convince them fine folk that all boat's ain't created perfect.
They ain't have'n it, calling me crazy and such.
But, since you got me. When is the last time you saw a boat made with ALL 316 SS?
And, do you buy from the 316 bin at WM or MacDonalds?
Oh, so now you gonna stick up for that mean bastid Parker? Whatever...

Anyway, only buy my hardware at Marsh Fasteners. They have domestic and foreign made plus they got some beautiful titanium stuff now and it’s only 6 times higher than 316 domestic!
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Old 03-12-2019, 08:15 PM
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This is is actually not true. 316 is actually farther away from aluminum in galvanic potentional ( worse) . The potential ( in the presence of electrolyte) is actually what causes galvanic corression.

Originally Posted by keysdiver View Post
316 Stainless fasteners should be used with aluminum.
There will be no reaction between them. There is no need for any "isolator" or lubricant unless you are installing something that you plan to disassemble in the future.
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Old 03-13-2019, 03:09 AM
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There is no product that eliminates galvanic action between dissimilar metals in contact but some will slow the process. You did not provide a comprehensive description of application but SS through bolts installed with neoprene and/or nylon washers against aluminum will minimize galvanic corrosion. This configuration worked well for 10+ years to secure dock and anchor cleats on my 18’ aluminum center console.
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Old 03-13-2019, 03:20 AM
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Duralac.

It works.
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Old 03-13-2019, 03:32 AM
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Originally Posted by TheBigWhit View Post

Oh, so now you gonna stick up for that mean bastid Parker? Whatever...

Anyway, only buy my hardware at Marsh Fasteners. They have domestic and foreign made plus they got some beautiful titanium stuff now and it’s only 6 times higher than 316 domestic!
Hey BW, I don't think he is talking about me, there is a thread about Parker Boats right now that has most captivated. Having Parker as a last name ain't always good.
Originally Posted by mneal View Post
This is is actually not true. 316 is actually farther away from aluminum in galvanic potentional ( worse) . The potential ( in the presence of electrolyte) is actually what causes galvanic corression.

I think the correct term is "Electrolytic Activity".
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Old 03-13-2019, 05:13 AM
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The galvanic corrosion potentials for passive 304SS and 316SS in contact with 6061 aluminum are actually very comparable. In fact, the indices are the same in the galvanic corrosion tables we use at the space center for design work in corrosive environments. Teflon washers are a good isolation method and any of the anti-seize pastes/compounds will help mitigate the galvanic corrosion problem (although as one poster above mentioned, the pastes only slow the process, not prevent it).
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Old 03-13-2019, 09:15 AM
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After rereading the initial post I'm not sure a tender bracket mounted on a swim platform is a good idea but you could use more aluminum fasteners to achieve the same assembly strength as fewer stainless steel..
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Old 03-13-2019, 11:48 AM
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Marine grade anti-seize is non-metallic for use between stainless and aluminum.
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Old 03-17-2019, 07:43 AM
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As usual, multiple conflicting opinion from the THT fraternity, but the feedback is appreciated.

Thought my original post was clear, but I'm trying to isolate the threaded assembly points where 316 stainless machine screws mount to aluminum. I'll use nylon washers under the heads, but you can't isolate threads with a bushing or washer. And through bolting with a bushing is a better design, but unfortunately not an option.

Sounds like Tef-Gel or lanolin is the best ticket -- with full understanding that it will reduce, but not eliminate the galvanic action.

Thanks all.
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Last edited by lydoniablock; 03-19-2019 at 05:50 AM.
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