Galvanic Corrosion

Fasteners for Aluminum

• This article says that stainless is best for screwing in aluminum, but must minimize corrosion such as rubber washer between screw head and aluminum sheet. It does not talk about contact between threads of screw and the aluminum - it appears the head is more important than the threads. [1]
• Stainless and galvanized are ok with aluminum, as long as not salty environment [2]
• This forum says epoxy coat screws for aluminum [3]

Deck Screws

• Are deck screws compatible with aluminum? Some deck screws are polymer coated so they should work with aluminum if polymer doesn't srip
• Deck screws are G185 or polymer coat [4]
• Polymer coat on deck screws is epoxy [5] or ceramic [6]
• Triple Coated Deck Screws - two coats over galvanized screw [7] but not for marine.

Pole Barn Screws

• 1" menards - [8]
• They are galvanized - [9]
• Stitch screws - for bonding short lengths of metal [10]

Drill Point Screws

• Compatible with treated, 3/4" long [11]
• Sharp point - 1" - [12]

Aluminum and Galvanized Steel

• Not compatible. Use rubber washer between.

Shopping

• Galvanized pole barn screws for aluminum [13]

Links

• Fasteners