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#21 |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
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![]() That simplifies it a lot, thanks.
Wiki doesn't help much other than illustrating why I asked: http://en.wikipedia.org/wiki/Screw TC |
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#22 |
Banned
Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010
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![]() They are flanged head bolts. Given the softness of the head I would be surprised if the bolt is that hard, but it could have been induction hardened. They are 60mm including the head (I know I should have measured the threaded portion), and as you can see, a good 5mm is non-loaded.
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#23 |
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Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010
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![]() Sorry, should have uploaded the photo!
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#24 |
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75 Contemporary SE Mk II 2004 Auto. Sal. CDTi Join Date: Nov 2010
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![]() The end of that screw has been specially machined, I wonder why ?
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#25 |
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MG ZT+ V6 190 Join Date: Nov 2011
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![]() Looks like it's designed to also locate the part as well as hold it and the end of the bolt is designed to locate properly, to minimise any cross-threading!
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#26 |
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#27 |
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MG ZT+ V6 190 Join Date: Nov 2011
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#28 |
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75 Contemporary SE Mk II 2004 Auto. Sal. CDTi Join Date: Nov 2010
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![]() Rimmers NLA, Brown and Gammon NLA, X-Part 1 off - and thats all the google results pull up with that part number
![]() ![]() ![]() I have also found a posting from another forum that shows them NLA in May 2006, and they confirm its M12 fine thread too. Its starting to look like a special run off from a machine shop ![]() |
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#29 |
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Rover 75 Tourer CDT Connoisseur SE Join Date: Dec 2010
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![]() If you can find a machine shop that will happily work with 12.9 grade bolts! Although there is no stamping on the head of these so it is possible (unlikely) that these are "normal" steel. I think the end of the thread is designed to clean out the threads as they are removed, like a tap. I doubt if it gives any physical properties to the bolt. Interestingly Rover only recommend a torque load of 100Nm which is not a lot, given the stresses on these bolts. Just going from 8.8 to 12.9 bolts gives a 30% increase in strength, but I just wonder how much stress these bolts need to take?
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#30 |
Gets stuck in
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![]() Hi, I would use these with a suitable washer https://www.spaldingfasteners.co.uk/...olts-grade-129
Regards John |
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