screw material for aluminum

Old 09-11-20, 01:58 PM
Thread Starter
Join Date: Apr 2011
Location: USa
Posts: 107
Received 1 Vote on 1 Post
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...
Old 09-11-20, 02:07 PM
Marq1's Avatar
Join Date: Sep 2016
Location: USA MI
Posts: 7,299
Received 489 Votes on 453 Posts
Aluminum and any metal in the presents of water will cause electrolysis,

Here are aluminum sheet metal screws.
Old 09-11-20, 02:27 PM
Join Date: Oct 2015
Location: Ct.,USA
Posts: 2,034
Received 111 Votes on 97 Posts
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.
Old 09-11-20, 02:46 PM
Norm201's Avatar
Join Date: Sep 2013
Location: United States
Posts: 9,993
Received 342 Votes on 308 Posts
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
Old 09-11-20, 08:47 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 61,900
Received 1,481 Votes on 1,369 Posts
You might want to consider aluminum rivets too.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: