screw material for aluminum


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Old 09-11-20, 01:58 PM
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screw material for aluminum

I'm replacing the wooden floor on my old aluminum boat. It gets fastened down with sheet metal screws into the fittings, which I believe are aluminum like most of the boat. What sort of screws do I need? Are there aluminum ones available? Would stainless steel be ok? I understand that putting two different kinds of metal into contact together can sometimes cause a reaction...
 
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Old 09-11-20, 02:07 PM
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Aluminum and any metal in the presents of water will cause electrolysis,

Here are aluminum sheet metal screws.

https://www.mcmaster.com/aluminum-sh...r-sheet-metal/
 
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Old 09-11-20, 02:27 PM
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Be careful, aluminum is soft so it is easy to destroy the drive slot if over torqued during installation. Hopefully the wood sits nice and flat.
 
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Old 09-11-20, 02:46 PM
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Stick with Al. to Al. Most screws available in home improvement store will be aluminum. But bring a magnet to be sure. And as mentioned do not over torque less you strip the mounting bracket.
Specifically, SS and Al are not compatible without coatings or some other type of insulator between the metals.
Zinc or galvanized is the next best choice. Plain steel is OK also but the fastener subject to rusting.

See the attached table to guide you

https://www.bing.com/search?q=is+sta...78fcad6999978f
 
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Old 09-11-20, 08:47 PM
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You might want to consider aluminum rivets too.
 
 

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