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Stainless Fasteners in Aluminum Plate

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Stainless Fasteners in Aluminum Plate

Old 03-09-2019, 02:55 PM
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Default Stainless Fasteners in Aluminum Plate

Obviously dissimilar metals and asking for trouble. Aluminum fasteners probably aren't strong enough for this application.

Is there a thread compound that mitigates the galvanic action of these dissimilar metals? I've heard wives tales about using lanolin, but there's gotta be a better idea.

For the curious... it's a swim platform mounted bracket for my tender that's subjected to loads that will stress the threaded hardware that screws its various parts together. No way to isolate with a bushing.
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Old 03-09-2019, 03:04 PM
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Nylon washers are readily available at any marine hardware supply house.
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Old 03-09-2019, 03:18 PM
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Tef-gel
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Old 03-09-2019, 06:22 PM
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Electrical tape around the bolt helps too.
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Old 03-09-2019, 06:27 PM
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Good quality 316SS instead of typical 304SS will help along with Teflon washers and never seeze.
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Old 03-09-2019, 06:33 PM
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Tef- gel x 2
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Old 03-09-2019, 06:55 PM
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Originally Posted by Bruce1505 View Post
Tef- gel x 2
Can you Tef-Gel guys explain why itís better than Never Seeze ? Does it stop stainless galling like NS does? Info appreciated. Love to learn new and better ways.
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Old 03-09-2019, 11:11 PM
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https://www.tefgel.com/contain.php?param=tefgel_infor

Should explain how tef gel works.
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Old 03-10-2019, 12:22 AM
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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 03-10-2019, 12:28 AM
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Originally Posted by TheBigWhit View Post

Can you Tef-Gel guys explain why itís better than Never Seeze ? Does it stop stainless galling like NS does? Info appreciated. Love to learn new and better ways.
Tef-Gel X4
The common Never Sieze has copper in it, which is a no no.
Aluminum doesn't care if it's 304 or 316 ss. Both will create activity and blister paint, Powdercoat or LineX.
Use Tef-Gel and fuggitaboutit.
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Old 03-10-2019, 05:48 AM
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Yup i'm a Tef -Gel man too.
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Old 03-10-2019, 09:41 AM
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Tef-Gel here too. It both acts as an insulator for the dissimilar metals and fills in asperity spaces which inhibits crevice corrosion.
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Old 03-10-2019, 09:50 AM
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Originally Posted by DocStressor View Post
Tef-Gel here too. It both acts as an insulator for the dissimilar metals and fills in asperity spaces which inhibits crevice corrosion.

that's not what the people who make it say (from the link posted above):

"Tef-Gel does not electrically insulate hardware.

The PTFE (40%) is ultra fine powder that will extrude out of the contact area and into the voids of the surrounding areas.

Tef-Gel applied between electrical contacts and connectors does not increase the resistance of the connections even at hundreds of amps."



Any water-resistant grease will "fill in asperity spaces".


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Old 03-10-2019, 09:58 AM
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anybody mention tef gel yet?
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Old 03-10-2019, 10:01 AM
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Originally Posted by TheBigWhit View Post

Can you Tef-Gel guys explain why itís better than Never Seeze ? Does it stop stainless galling like NS does? Info appreciated. Love to learn new and better ways.
yes it will prevent galling
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Old 03-10-2019, 10:04 AM
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Originally Posted by rbhankins001 View Post
anybody mention tef gel yet?
i hear TefGel is pretty good stuff. Surprised so few people suggested it.

tefgel sticks, no-copper neversieze doesnít stick.

anything metal that isnít aluminum on boat gets Tefgel
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Old 03-10-2019, 10:07 AM
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I have been using Home Depot real stuff PTFE plumbers paste for many years on ss marine fasteners as an anti seize. It is readily available, inexpensive and very effective
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Old 03-10-2019, 10:25 AM
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I have a huge bottle of Pematex Anti Seize that I have used for years and so far no issues ever. I use it on any fastener with dissimilar materials. A little goes a long way.
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Old 03-10-2019, 11:03 AM
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Originally Posted by lydoniablock View Post
Obviously dissimilar metals and asking for trouble. Aluminum fasteners probably aren't strong enough for this application... galvanic action of these dissimilar metals? .
Is your aluminum plate made of: Al 1100, 2024-T4 or another type Al alloy?
What Al alloy is your plate material?
JJohnson here

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Old 03-10-2019, 11:09 AM
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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.
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".

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