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Thread: ARB Bar with 10mm bolt through 12mm holes

  1. 7th November 2014, 01:46 PM #1
    sam_d's Avatar
    sam_d
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    ARB Bar with 10mm bolt through 12mm holes

    I recently went to install my new recovery points from APT Fabrications which was supplied with M12 bolts. However, I found that the steering guard got in the way a little so I ordered some longer 180mm M12 Grade 8.8 bolts.

    I was already a little concerned about mounting the recovery points so far out from the chassis but when I came to install the new bolts I found that the original bolts holding the ARB Bull Bar to the chassis were M10 bolts and my new M12 bolts wouldn't fit through the holes in the bracket.

    The photos attached show the existing bolts. As you can see, I'd need longer bolts to be able to attach the recovery points. I'm a bit iffy about having the recovery points on bolts extending to far from the chassis as it is but even less sure about 10mm bolts.

    So, my question: I'm fairly sure that the mounting holes in the chassis of the Disco 2 are designed for 12mm bolts so is it okay to have the bull bar attached using 10mm bolts? Surely it wouldn't take much of a knock to cause the bar to shift out of place with amount of play a 10mm bolt would have in a 12mm hole. Would it be worth drilling out the holes in the bull bar mounting brackets to take 12mm bolts? Or, are 10mm bolts fine and suitable for attaching recovery hooks too even is they are a couple of centimeters from the edge of the chassis? Thoughts?

    Thanks in advance!
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  2. 7th November 2014, 02:21 PM #2
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    Not only would I suggest fitting the 12mm bolts by drilling out the brackets, but use nyloc nuts too. Spring washers are insufficient on a bull bar mounting.
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  3. 7th November 2014, 04:26 PM #3
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    At least do a couple of the 12mm per side to locate the bar correctly without the movement. If you use a step drill it can be easier than drilling out with a 12mm bit, less jamming and movement and the holes are neatly chamfered when you are done.
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  4. 7th November 2014, 05:12 PM #4
    billy bob Guest
    Remember all bolts need clearance.
    So a 12mm bolt should have a 12.5 to 13mm hole drilled.
    I did my apprenticeship in the aircraft industry where 0.5mm was used.
    Other fields are not so neat.
    More clearance means less care in manufacture.
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  5. 7th November 2014, 05:53 PM #5
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    You can drill out to fit the 12mm bolts.
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  6. 7th November 2014, 07:39 PM #6
    slug_burner
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    It is not about the hole and fastener sizes, it's about the clamping force.

    Drill the holes out, you already have the bolts.

    Not sure what you mean about the recovery points being so far out.
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  7. 8th November 2014, 07:37 PM #7
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    Just an update...

    Had I started on the driver's side last week I would have found that they'd used grade 5 bolts slightly under 1/2" on that side and 10mm grade 8.8 on the passenger side.

    The holes in the bracket are already suitable for 12mm bolts but since they didn't align perfectly with the holes on the chassis it seems that whatever bolt was handy and fitted best was used.

    A bit of pushing, shoving and a tiny amount of work with the step drill and hey presto, I've now got 12mm bolts in.

    Now, I've got to find a new steering guard that fits with the recovery points...
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  8. 9th November 2014, 01:16 PM #8
    Islandnomad
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    I thought that APT's Steering Guard had recovery points incorporated into it?
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  9. 9th November 2014, 02:09 PM #9
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    Quote Originally Posted by Islandnomad View Post
    I thought that APT's Steering Guard had recovery points incorporated into it?
    It does. I only got the recovery points thinking the existing guard would still fit. I suspect I'll be buying the APT Steering Guard next week.
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  10. 9th November 2014, 03:46 PM #10
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    Check out Vimeo DSCF5189 for my notes on this matter, I filed out the chassis rails, the anti crush tubes remain in place and 14mm bolts are used.
    [ame="http://vimeo.com/105515286"]DSCF5189 on Vimeo[/ame] might be the link needed, sorry, cars I know a bit about, computers I know a bit about but the intertwitwebthingy an' I'm lost!!!!!!

    Still, 14mm bolts work.


    ****e I'm cleverer than I thought, look at that!!


    Cheers

    Mike
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