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Thread: Fastening ID

  1. #1
    Join Date
    Aug 2002
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    Sydney, Australia
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    Default Fastening ID

    Can anyone assist with the identification of this fastening. It was unearthed today approx 1ft under the ground where I was digging a pit next to my shed. The fitting is galvanised and 2 inches (50mm) in length and approx 9/64 (3.6mm) shank size. The collar is able to be detached from the shank. It looks something like a type of boat nail. The closest thing I can relate the collar to is a Port Jackson shark egg (local species here).

    Suggestions/advice appreciated.

    PeterW

  2. #2
    Join Date
    Apr 2010
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    South Australia and Tasmania
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    Default Re: Fastening ID

    Dunno but it looks like an early version expanding wall plug

  3. #3
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    Default Re: Fastening ID

    An engineer mate has just advised that it is for fastening into concrete.
    PeterW

  4. #4
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    May 2012
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    UK. Cornwall, Suffolk.
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    Default Re: Fastening ID

    How does it work? The nail is free to slide in the grippy shank...???

  5. #5
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    Sep 2007
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    Default Re: Fastening ID

    My guess is it was used for slate roofing or some other hard thin material that expands and contracts requiring freedom of movement.

  6. #6
    Join Date
    Oct 2000
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    Padanaram, MA USA
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    Default Re: Fastening ID

    Maybe a masonry drive anchor? Like the plastic anchors we have today.
    ... Insert cone in a deep hole and bash the nail into it to expand it. Doesn't explain the taper.
    Last edited by JimConlin; 07-24-2018 at 12:27 PM.

  7. #7
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    Default Re: Fastening ID

    Of course my first thought was those plastic things which attach all the plastic bits to your car, under the engine bay, inside the mudguards, door trims, boot liner etc. could be the Flintstones junked a car at your place way back when.

  8. #8
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    Default Re: Fastening ID

    There was a chook house on the site where it was found. That was a while back and well before our time.
    PeterW

  9. #9
    Join Date
    Nov 2011
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    5,417

    Default Re: Fastening ID

    It doesn't appear to me that the "bushing" is designed to crush the shaft as it is driven, unless perhaps it is split on the back side. Also, the shaft is only 1/8" diameter. I've never seen an anchor designed to go into concrete that uses such a thin shank. Then there's the head, which is mushroom shaped and not meant to be hammered on.

    I would say that the bushing is meant to be hammered into wood, where it will be forever, and the pin is meant to be removable, although if it were then the head would be a handle.

    Actually, I have no idea what that assembly would actually be useful for, actually.

  10. #10
    Join Date
    Jun 2010
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    PNW, an island west of Seattle
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    Default Re: Fastening ID

    Looks like a pop rivet.

    Jeff

  11. #11
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    Apr 2000
    Location
    Southampton Ont. Canada
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    Default Re: Fastening ID

    The collar could have carried insulating material for early electric fence/ power/telephone.

    image.jpg

    R
    Last edited by Ron Williamson; 07-25-2018 at 05:23 AM.
    Sleep with one eye open.

  12. #12
    Join Date
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    Hyannis, MA, USA
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    Default Re: Fastening ID

    Having seen similar, my vote's with Ron.

  13. #13
    Join Date
    Jul 2017
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    Toodyay, Western Australia
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    633

    Default Re: Fastening ID

    Quote Originally Posted by PeterWidders View Post
    There was a chook house on the site where it was found. That was a while back and well before our time.
    The chooks were having a cocktail party enjoying skewers of shark eggs, but when the toothpicks ran out they skewered the eggs with nails nicked from the farmer's shed.

  14. #14
    Join Date
    Nov 2008
    Location
    tacoma washington
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    Default Re: Fastening ID

    looks like a earlier edition of zamac nail...yes they are concrete anchors

  15. #15
    Join Date
    Jul 2000
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    N.E. Connecticut.
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    Default Re: Fastening ID

    My thoughts were heading in the direction of Ron’s too.

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