Best type of screws for fastening to aluminum

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Best type of screws for fastening to aluminum

Postby kmack67.km » Thu Sep 26, 2019 3:27 pm

Hi, I have read a bunch of stuff online about steel and SS screws corroding aluminum after some time. What type of screws/coating do you recommend for attaching stuff to aluminum and where did you get them? This is for a cargo trailer conversion. The trailer frame and exterior are all aluminum. Any help would be greatly appreciated.

Best regards,
Kevin
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Re: Best type of screws for fastening to aluminum

Postby John61CT » Fri Sep 27, 2019 4:56 pm

3M 5200, Sikaflex 292, or the right VHB tape for permanent bonds

4200 or Sikaflex 291 if you think you might ever need to undo.
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Re: Best type of screws for fastening to aluminum

Postby Pmullen503 » Fri Sep 27, 2019 6:57 pm

Aluminum pop rivets.
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Re: Best type of screws for fastening to aluminum

Postby MatBirch » Fri Sep 27, 2019 11:55 pm

My day job is building all aluminum truck bodies and trailers. We use standard zinc plated screws for our tek type fasteners, mostly aluminum rivets, plated steel monobolts and huck bolts. Door hardware is always stainless. Anything steel gets isolated with duct tape or tyvek before install.
Coatings are always urethane caulk, urethane fleet automotive finishes after sanding and a chemical etch/de-ox.
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Re: Best type of screws for fastening to aluminum

Postby kmack67.km » Mon Sep 30, 2019 10:55 am

That is great. Thank you all for the info.

Kevin
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