Type of screws to use

Discussion in 'Boat Modification Journal' started by SCcatman, Feb 26, 2009.

  1. SCcatman

    SCcatman New Member

    Messages:
    64
    State:
    South Carolina
    I plan to use 2x2 lumber and simpson strong ties to attached the braces to the ribs in the boat. I purchased #8-5/8" self tapping metal screws from Home Depot, they are ZINC, after i got home I starting thinking about if the ZINC screws will corrode the aluminum...can someone verify if this will happen or am I good to use them?

    Thanks
     
  2. AwShucks

    AwShucks New Member

    Messages:
    4,532
    State:
    Guthrie, Oklaho
    My understanding is the only metal compatible with aluminum is stainless steel or an aluminum screw. I can't for the life of me remember if brass is compatible. LOL Here is a table I found if it will help any...

    http://www.mckmetals.co.nz/aluminium-page7.asp

    Whoa, seems as though brass is a big no-no.
     

  3. katplayer187

    katplayer187 New Member

    Messages:
    136
    State:
    WEST END-PITTSBURGH,PA
    go stainless about to start the same project got screws today at lowes 25 for 10$ and some change.
     
  4. Katmandeux

    Katmandeux New Member

    Messages:
    1,618
    State:
    Checotah, Oklahoma
    Aren't the strongties galvinized? Put a layer of something non-metallic between the m and the hull. Vinyl flooring might work...

    In truth, it's salt water that makes for bad juju w/ dissimilar metals. You can get away with a lot in fresh water. Still, an ounce of prevention, yada, yada, yada...
     
  5. SCcatman

    SCcatman New Member

    Messages:
    64
    State:
    South Carolina
    I went ahead and exchanged them for stainless, however I bought a box of 50 #8-3/4" for $4.37 plus tax.

    I assume you purchased a larger??

    I believe they are glavanized, I was not aware that would corrode aluminum??
     
  6. cantstopgrandma

    cantstopgrandma New Member

    Messages:
    955
    State:
    MD
    Yeah, brass, zinc, galvanized is all bad for aluminum. Says right in my owners manual to only use stainless or aluminum in the boat.