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  1. #1
    Join Date
    Jul 2013
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    Default identifying this fastner

    i am trying to name this screwbolt, boltscrew, fastner in order to get a hold of some fairly urgently.

    looks like M12 with drilling point.

    sort of an oversized trek screw.

    Ive seen them used on fascia brackets and in the automotive industry but can't find a name or type on the internet so far.

    any clues?
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  2. #2
    Join Date
    Jun 2007
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    Default

    More like "self tapping screw". M8 with 7/16 drive?

  3. #3
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    Default

    jackaroo,

    answering my my own question here : ) ........might help someone in the future perhaps.

    type 23 self threading or thread cutting screw

    hex washer head.

    with a slightly more conical head than shown here (att)

    now to find a supplier .

    cheers for clue
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  4. #4
    Join Date
    May 2011
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    Murray Bridge S Aust.
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    Default

    I'd call them a Hex 12 mm self drilling bolt. Unfortunately, I can't find anything related to the bolt shown but ordinary TEK screws.
    Kryn
    To grow old is mandatory, growing up is optional.

  5. #5
    Join Date
    Sep 2015
    Location
    Perth
    Posts
    62

    Default

    Supercheap auto has some automotive fasteners like that. Usually in small quantities though.

  6. #6
    Join Date
    Apr 2008
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    Perth
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    269

    Default

    Looks to me to be a Tec screw for metal without the rubber washer. Bunnies is your store for them, get them both for metal and wood

    DD

  7. #7
    Join Date
    Jul 2009
    Location
    Brisbane
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    Default

    Looks to me like the Type 2 is a tapping screw but you need to drill the appropriate hole first whereas your original looks to be self drilling and self tapping.
    Sorry I can't help with your question though.

    pcx

  8. #8
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    Nov 2008
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    North Brisbane. Qld. Australia
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    Default

    I think Type 23 Indented Hexagon Washer.

    https://www.victorybolt.com/Details/Item/3SWS

    I don't think they are self drilling except maybe for thin materials.
    Nev.

  9. #9
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    Nov 2008
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    North Brisbane. Qld. Australia
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    Default

    What are these being used for? That info will help.
    Nev.

  10. #10
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    Default

    Quote Originally Posted by steve.rsa View Post
    Supercheap auto has some automotive fasteners like that. Usually in small quantities though.
    Unless they will take a nut they will not be automotive.
    Nev.

  11. #11
    Join Date
    Jun 2004
    Location
    Kyabram. Vic
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    632

    Default

    Chassis bolts into captive nuts

    Ken

  12. #12
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    Nov 2008
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    Default

    Quote Originally Posted by Toggy View Post
    Chassis bolts into captive nuts

    Ken
    Yes they are quite often a fine pitch thread such as M12 x 1.25 which is what they are, on the front chassis of my Toyota Surf. I was referring to the OPs which may not have a thread that you can fit a nut onto.
    Nev.

  13. #13
    Join Date
    Jul 2013
    Location
    nsw
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    Default

    thanks for replies!

    i've seen them on " blow away sheds", sorry kit sheds, where a lean -to bracket is fastened to a post such as 89x89x3.

    they attract me because they are a super sized tek screw in my eyes, and could be handy in fab jobs and sheet metal type applications.

    the oversize hex washer head makes for good bearing pressure.

    attaching strong brackets is my main application i reckon.

    Dingo, the shaft is 10mm diameter and bunnings peters out at about 6 mm unfortunately.

  14. #14
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    Nov 2008
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    Default

    I've drilled a tapped thick walled RHS/SHS before for attaching clothes line brackets etc. Just use a bolt with a fine pitch. Nutserts also work for this. Maybe counter bore a little for the head of the nutsert. Not sure if a self threading bolt has a finer or more suitable thread for this type of fixing. As far as I know they still require a pilot hole the correct size. Can you identify what thread you bolt has?
    Nev.

  15. #15
    Join Date
    Apr 2008
    Location
    NSW
    Posts
    537

    Default

    Decking screw , self drilling self tapping
    The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.

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