Rogthebandit
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| posted on 18/2/12 at 11:01 PM |
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Thread protrusion
Hi
Just building up the suspension on the mk. Can anyone give me advice on the thread protrusion for the iva inspection. I have about 2 threads showing
past the nylock. Just want to make sure them there testers are not going to fail me when I get it tested. Also do the suspension bolts need to be
greater than 8.8s ?
Cheers
Rog
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daviep
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| posted on 18/2/12 at 11:21 PM |
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2 threads is good enough as is 8.8 
“A truly great library contains something in it to offend everyone.”
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designer
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| posted on 19/2/12 at 09:06 AM |
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The minimum thread projection is 1 1/2 threads.
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britishtrident
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| posted on 19/2/12 at 09:34 AM |
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As protruding threads as above .. so no worries.
8.8 or grade 8 are fine for suspension bolts provided they are adequately sized to start with but 10.9 is better..
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Rogthebandit
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| posted on 19/2/12 at 10:04 AM |
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Cheers chaps, that's sound, I shall carry on with the build :-)
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Davegtst
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| posted on 22/2/12 at 06:30 PM |
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I've just checked mine and I only have 1 thread at the most. Looks like I need longer bolts which is strange as these were the bolts mk
supplied. Would there be any problem using stainless bolts?
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Andybarbet
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| posted on 22/2/12 at 06:52 PM |
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As far as I know stainless bolts are a no go on suspension due to being brittle compared to steel ones.
I will let the Locost fountain of knowledge correct me ive been mis-informed
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iank
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| posted on 22/2/12 at 07:14 PM |
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quote:
Originally posted by Andybarbet
As far as I know stainless bolts are a no go on suspension due to being brittle compared to steel ones.
I will let the Locost fountain of knowledge correct me ive been mis-informed
I believe you are correct, I believe stainless would likely fail IVA if used on suspension.
8.8 is said to be best for suspension (iirc there are two theories either as an 8.8 bends rather than snapping like harder 12.9 if you hit a curb too
hard you're likely to keep the wheel all be it at a funny angle, or it will protect the chassis more by breaking where the chassis will tend to
bend and suspension brackets rip off before a 12mm 12.9 lets go.) Take your pick, but 8.8 passes IVA fine.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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Stott
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| posted on 22/2/12 at 07:15 PM |
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quote:
Originally posted by Davegtst
I've just checked mine and I only have 1 thread at the most. Looks like I need longer bolts which is strange as these were the bolts mk
supplied. Would there be any problem using stainless bolts?
Don't use stainless for the reason above
As for a solution to your problem get a load of form b washers and replace all your normal ones which will save you changing all the bolts.
They are about 1/2 - 3/4 thickness so will get a little more thread showing.
ATB
Stott
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britishtrident
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| posted on 22/2/12 at 07:23 PM |
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Are flange nuts accepted by "the powers that be" as self locking ? they are generally a lower height (height = dia) and don't
require washers.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Neville Jones
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| posted on 23/2/12 at 10:39 AM |
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Flange nuts aren't accepted, as they aren't self locking. I've even had aero stiff nuts questioned.
Two threads protruding is mandatory for IVA.
Above is for Southampton and Reading, other stations may differ in interpretation.
Cheers,
Nev.
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loggyboy
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| posted on 23/2/12 at 10:55 AM |
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quote:
Originally posted by Neville Jones
Above is for Southampton and Reading, other stations may differ in interpretation.
Cheers,
Nev.
Reading?
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Davegtst
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| posted on 23/2/12 at 03:08 PM |
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quote:
Originally posted by Stott
quote:
Originally posted by Davegtst
I've just checked mine and I only have 1 thread at the most. Looks like I need longer bolts which is strange as these were the bolts mk
supplied. Would there be any problem using stainless bolts?
Don't use stainless for the reason above
As for a solution to your problem get a load of form b washers and replace all your normal ones which will save you changing all the bolts.
They are about 1/2 - 3/4 thickness so will get a little more thread showing.
ATB
Stott
Thanks, i did think of this but i don't think it would be enough. I have just bought a load of 8.8 bolts 5mm longer which are a lot better. It
would drive me mad if i failed the IVA for the sake of £10 worth of bolts.
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britishtrident
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| posted on 23/2/12 at 05:06 PM |
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Thread copied for future reference.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Neville Jones
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| posted on 23/2/12 at 06:11 PM |
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quote:
Originally posted by loggyboy
quote:
Originally posted by Neville Jones
Above is for Southampton and Reading, other stations may differ in interpretation.
Cheers,
Nev.
Reading?
Yep, used to be an SVA station in Reading. I've use Southampton nowdays.
Cheers,
Nev.
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jacko
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| posted on 23/2/12 at 08:10 PM |
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Why not fit half nuts you can buy them and they will give you enough thread
M12 HALF NUTS / LOCKNUTS 12mm BZP (Pack 20) | eBay
[Edited on 23/2/12 by jacko]
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phelpsa
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| posted on 26/2/12 at 03:22 PM |
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Kaynuts are generally quite slim and aerospace certified.
http://www.nasbolts.co.uk/acatalog/Metric_K_Nuts.html
Not cheap though 
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MEERKAT
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| posted on 28/2/12 at 06:21 PM |
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Can you have too much thread showing?
"To alcohol, the cause and solution to all of life's problems"
- Homer J Simpson
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