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Author Subject: Brake bell to rotor bolts
Tallguy_2

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Location: Alton

Registered: 08 Aug 2012

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Post #1
Quick question,

I have the 330mm setup on my car, however I'm not sure who supplied the kit to start with. Gone to change the rotors today and as you can imagine the bolts were far from desireable having been faced with some pretty serious conditions where they are located.

On ash's kit what size Allen key and socket do you use?

I was using a 3/16 Allen key and 7/16 socket, suggesting to me I'm going to have to get imperial bolts again so that there is no movement through the holes in the bells?

Any help or advice would be much appreciated!! Thanks

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Posted 30th Jun 2013 at 10:52
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allanallen

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Location: Buxton

Registered: 01 May 2007

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Post #2
They're more than likely 1/4 unf bolts, although a rusted up m6 may undo with a 3/16 Allen key. Best ways obviously to measure the bolt shank with a vernier caliper.

Al

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Posted 30th Jun 2013 at 11:47
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Tallguy_2

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Location: Alton

Registered: 08 Aug 2012

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Post #3
Yeah they are definitely imperial, the whole setup has imperial parts, I suppose wilwood are American, just want to make sure the bolts are a really good fit through the holes in the bells

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Posted 30th Jun 2013 at 13:52
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dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

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Post #4
Take one of the existing ones to your local decent fastenings place and they should be able to sort you out for a quid or so Thumbs up

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    • Posted 30th Jun 2013 at 13:55
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    buzzbrightyear

    Seasoned Pro

    Location: hiding all receipts for car

    Registered: 09 Jul 2008

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    Post #5
    Is it one of ash's kits?

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    Posted 30th Jun 2013 at 15:19
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    matt evans

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    Location: Stourbridge

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    Post #6
    AP racing do bolt kits, which come with a proper heatproof K-nut type locking nut, again, always imperial sizes for some reason. Buy them in boxes of however many you need per rotor

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    Posted 30th Jun 2013 at 16:38
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    Tallguy_2

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    Post #7
    Thanks guys, just had a look at that Matt, looks good, don't know why I didn't think of that sooner!! Going to pop into a local fastenings place tomorrow and see how I get on.

    No I'm 99% it's not ash's it's been made bespoke I think

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    Posted 30th Jun 2013 at 21:37
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    Jon foz

    Newbie

    Location: Prescot

    Registered: 25 Jul 2013

    Posts: 45

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    Post #8
    Rotor bolts have a special coating on them,would be safer using AP or similar replacement bolts

    Jon
    Posted 3rd Aug 2013 at 22:21
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    mechanical_repairs

    Seasoned Pro

    Location: leicester

    Registered: 10 Jan 2005

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    Post #9
    I have a box full of these at work from where I did the brake upgrade kits.
    Let me know if your still after some and how many.
    Carl

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    Posted 4th Aug 2013 at 22:17
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    coskev

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    Location: Oswestry

    Registered: 01 Nov 2009

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    Post #10
    Jon foz wrote:
    Rotor bolts have a special coating on them,would be safer using AP or similar replacement bolts

    Jon


    Do you know what grade steel they should be?Thumbs up

    As I've just stripped some down that were using stainless steel button heads!!!Pretty sure they are not strong enough?Dunno

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    Posted 12th Aug 2013 at 19:23
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    tvrfan007

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    Post #11
    Should be 10.9s I would think, possibly 12.9s. Smile

    Phil will be along shortly i'm sure.

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    Posted 12th Aug 2013 at 21:30
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #12
    I doubt they will be that high given the size.

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    Posted 12th Aug 2013 at 21:35
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    tvrfan007

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    Post #13
    The material properties (i.e. 10.9) are defined by the material, not the size!

    Can't say i've ever looked for brake bell bolts, but you can buy 10.9s in lots of small sizes. Smile

    Do the old ones not have any markings on the head? Go down your local fasteners place, the guys in Sterling in Peterborough would have just the ticket for instance. I wouldn't waste time looking as they'll tell you the thread size in minutes and probably offer you solutions.

    Or, e.g. http://www.ebay.co.uk/itm/M8-Low-Cap-Head-Socket-Screw-Allen-Bolt-Steel-Grade-10-9-Pks-of-10-20-50-/290784276851 though it's worth questioning the steel origin and that's obviously a metric example. Smile

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    Posted 12th Aug 2013 at 21:46
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