 | Home > Maintenance & Modifications > Bulkhead to chassis outrigger bolt. |
 
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2661  
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Definitely M12 and 180mm long, if yours is another thread then someone’s changed it.
AYG500080 is the LR part number it you want to buy it that way, although any fixings supplier will sell you some cheaper, they’re just standard 8.8 grade bolts - nothing special. |
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11th Jun 2021 7:56pm |
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| markb110 Member Since: 22 May 2010 Location: Guildford Posts: 2647  
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If you have rock / tree sliders you will need a longer bolt.
When i fitted my tree sliders i had no issues with removing one bolt at a time to replace them. Remember, lots of copper grease.  |
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11th Jun 2021 8:31pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4219  
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I’m fairly certain the bolts never been out, but the nut won’t screw into another m12 bolt, and I can run 7/16 Whitworth tap through it nicely. 2007 110 TDCi Station Wagon XS |
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11th Jun 2021 8:44pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4219
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It is to be replaced with longer ones 2007 110 TDCi Station Wagon XS |
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11th Jun 2021 8:44pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17478 
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Interesting but inconclusive. The correct bolt is M12 as stated above. An ISO M12 coarse bolt has a major diameter of 11.966mm and a pitch of 1.75mm. A 7/16" BSW bolt has a major diameter (in newfangled metric units) of 11.113mm and has 14 TPI, which equates to a metric pitch of 1.814mm. I have never tried it (why would anyone?) but it is entirely possible that the slightly smaller major diameter of the BSW thread form and the very close equivalence in pitch would allow a 7/16" BSW tap to pass through an M12 nut with no difficulty. |
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11th Jun 2021 10:11pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4219
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When I get them out next week, I’ll be able to measure them up properly. 2007 110 TDCi Station Wagon XS
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12th Jun 2021 9:29am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17478
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If you can post a clear photo of the bolt head it should be immediately obvious from the head marking whether it is BS, Unified, or ISO.
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12th Jun 2021 9:53am |
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| Mossberg Member Since: 29 Feb 2020 Location: Lancs Posts: 553 
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Mine were M12x180 though I think longer is in order if you are fitting rock sliders etc. For the price of a bolt, buy an extra one to use as a punch to tap the old one out - when you are getting to the point where you are pushing past the outrigger/bulkhead joint, give it a good knock to push past that joint. Also have the jack supporting the bulkhead to minimise any chance of it dropping. You will have to do this twice or it will be the wrong way around.
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12th Jun 2021 6:31pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4219
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The bolt that came out was indeed m12 x 180. It’s just the threads on the nut just got mangled stopping it from going on another bolt, hence the confusion.
Incidentally, the original bolts are marked 10.9 grade not 8.8. So the longer 8.8s I got today are no good, need to get hold of 10.9s. 2007 110 TDCi Station Wagon XS |
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14th Jun 2021 5:51pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17478
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That is interesting. It is unlikely that there would be any problem using 8.8 for that application, but if 10.9 came out then putting 10.9 back is probably best, even if only for peace of mind. If you have any trouble finding these, it is worth remembering that hex socket head bolts (often - incorrectly - called "Allen bolts") will be 10.9 as standard. |
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14th Jun 2021 7:19pm |
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