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Thread: hex head metric gr 12.9 bolts black oxide

  1. #1
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    hex head metric gr 12.9 bolts black oxide

    anyone know where to get them? most hex are only 10.9, and 12.9 usually are socket capscrews which wont work. found one place in UK but wont ship.

    m10x75 gr12.9 part thread

    TIA
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    Ring Industrial fasteners 02 9534 6844 ask for David

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    Don't like your chances at Industrial fasteners. Reckon your only likely source is older Jap head bolts, before they went internal wrenching or stretch, but they're usually metric fine rather than M10, the usual dot and dash marking should make them somewhere around T11 which might be close to 12.9?? Other than that, ARP maybe for a 12 point.

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    Unbrako do a 12.9 flanged hex head.

    Edit: they are called Durlock and are antivibration.

    https://www.unbrako.com.au/durlok
    Last edited by Fondles; 16-06-19 at 08:57 AM.

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    unbrako do a low head height socket head but only upto 70mm (that might be ok need to check engagement). the flanged hex are only upto 50mm
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    [DIRTY31] lysdexia's Avatar
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    these are nigh on impossible to find as there's nothing in the Australian standards for fasteners that covers them.

    I have had them custom made for clients in the past, they're not cheap though
    Quote Originally Posted by Mr Jones View Post
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    Arrogant wankeler Slides's Avatar
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    A mate had custom flywheel bolts made for a conversion, I think it was somewhere mid north coast, can ask him.


    Edit: K&C Harris apparently.
    Last edited by Slides; 17-06-19 at 03:10 PM.

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    Quote Originally Posted by Slides View Post
    A mate had custom flywheel bolts made for a conversion, I think it was somewhere mid north coast, can ask him.


    Edit: K&C Harris apparently.
    thanks but i would probably get some socket head capscrews and get the head machined to a hex and then thinned down. the reason they need to be hex is only because the height of the head must be 8mm or less in thickness. an alternative is to counter bore a few mm but would like to avoid the stress raiser
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    [DIRTY31] lysdexia's Avatar
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    if the head height is the only issue, try a low head socket head screw. I'm not sure off the top of my head how tall an m10 head is on one, but I think it would be 8mm or less for sure
    Quote Originally Posted by Mr Jones View Post
    Farmer its all about how you cut them up, like a dead hooker jigsaw puzzle.

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    It's just as hard to find low height socket heads long enough
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    Bannered takai's Avatar
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    What about button head cap screws, they tend to be much lower profile than socket heads.
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    Registered User dnegative's Avatar
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    Use cap screws, do them up and grind them till they clear lol
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    Quote Originally Posted by takai View Post
    What about button head cap screws, they tend to be much lower profile than socket heads.
    bingo thanks, though some places say the head is not suitable for critical high tensile applications, which then makes it odd to make them from 12.9 grade...

    http://www.brightonbest.com.au/the_r...atalogsAU.html

    http://www.brightonbest.com.au/the_r..._AU_Socket.pdf
    Last edited by E30is; 19-06-19 at 07:02 PM.
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    Gas Turbine enthusiast da9jeff's Avatar
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    Quote Originally Posted by E30is View Post
    bingo thanks, though some places say the head is not suitable for critical high tensile applications, which then makes it odd to make them from 12.9 grade...

    http://www.brightonbest.com.au/the_r...atalogsAU.html

    http://www.brightonbest.com.au/the_r..._AU_Socket.pdf
    I'd guess for high shear loads?

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    They won't allow button heads in FSAE for any important loaded components, distance from the shank to the internal hex was the reasoning as I remember. Looking at ARP, they do 70 and 80mm if you can live with the price and grip length. https://arp-bolts.com/kits/arpkit-de...?RecordID=2948

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    Quote Originally Posted by gxxr View Post
    They won't allow button heads in FSAE for any important loaded components, distance from the shank to the internal hex was the reasoning as I remember. Looking at ARP, they do 70 and 80mm if you can live with the price and grip length. https://arp-bolts.com/kits/arpkit-de...?RecordID=2948
    i emailed ARP the heads are taller than a conventional hex as they have the flange.
    E30 325is M20 3.1L

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