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Thread: identifying this fastner
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7th Aug 2017, 12:03 AM #1Senior Member
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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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7th Aug 2017, 12:19 AM #2Golden Member
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More like "self tapping screw". M8 with 7/16 drive?
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7th Aug 2017, 12:34 AM #3Senior Member
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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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7th Aug 2017, 12:48 AM #4Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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7th Aug 2017, 09:04 AM #5Member
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Supercheap auto has some automotive fasteners like that. Usually in small quantities though.
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7th Aug 2017, 10:22 AM #6Senior Member
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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
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7th Aug 2017, 05:55 PM #7Intermediate Member
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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
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7th Aug 2017, 06:59 PM #8Most Valued Member
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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.
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7th Aug 2017, 07:30 PM #9Most Valued Member
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What are these being used for? That info will help.
Nev.
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7th Aug 2017, 07:31 PM #10Most Valued Member
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7th Aug 2017, 08:03 PM #11Golden Member
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Chassis bolts into captive nuts
Ken
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7th Aug 2017, 08:16 PM #12Most Valued Member
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7th Aug 2017, 08:56 PM #13Senior Member
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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.
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7th Aug 2017, 09:10 PM #14Most Valued Member
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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.
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7th Aug 2017, 10:19 PM #15Golden Member
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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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