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#1 minimotion

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Posted 02 January 2017 - 06:49 PM

Anybody know the bolts size that hold the standard 8.4 calipers together all I can find are the bolts that hold the calipers to the carrier which are different

#2 Moke Spider

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Posted 02 January 2017 - 06:56 PM

I think they are 7/16" UNF, but a special grade.

 

Somerfords have them;-   http://www.somerford...roducts_id=3693



#3 minimotion

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Posted 02 January 2017 - 07:14 PM

Will I be able to use stainless for this?

#4 robminibcy

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Posted 02 January 2017 - 07:38 PM

Will I be able to use stainless for this?

 

no, id stick with the specified ones. Stainless grades differ to steel and may cause a failure. Stainless can cause corrosion as well due to dissimilar metals.



#5 Moke Spider

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Posted 02 January 2017 - 08:03 PM

Will I be able to use stainless for this?

 

Definitely not. Stainless has next to no tensile strength.

 

Off hand, I recall the originals as being a Grade 10 Bolt. Stainless is typically around a grade 2 or 3.

 

As robminibcy suggests, use the originals.



#6 Steve220

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Posted 03 January 2017 - 10:25 AM

Will I be able to use stainless for this?


100% no. It's a load bearing bolt and needs the tensile strength.

#7 Will16

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Posted 03 January 2017 - 04:58 PM

 
Definitely not. Stainless has next to no tensile strength.
 
Off hand, I recall the originals as being a Grade 10 Bolt. Stainless is typically around a grade 2 or 3.
 
As robminibcy suggests, use the originals.

Sorry to hijack this, but just reading through it and it got me thinking, I've used M10 stainless bolts to bolt the rear of the front subframe to the toe board, with nyloc nuts. Will these be suitable or shall I swap them out for graded mild ones, before it hits the road? The stainless ones have like 'A2-70' on the head.

Edited by Will16, 03 January 2017 - 04:59 PM.


#8 minimotion

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Posted 03 January 2017 - 08:13 PM

No need to apologise this also is a help to as I'm completely rebuilding my mini from subframes up! So if the case is stainless aren't as strong what about the subframe fitting kit that smiffys bits sells? These just for the real shows cars or are we been cond into thinking stainless looks better lasts better cause our eyes rule our head?

#9 1984mini25

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Posted 03 January 2017 - 08:32 PM

 These just for the real shows cars or are we been cond into thinking stainless looks better lasts better cause our eyes rule our head?

 

Pretty much. just another load of shinny tat to attract the wallet happy magpies. Besides, try proving where a bolt came from when it fails and causes a serious accident.



#10 Moke Spider

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Posted 04 January 2017 - 02:45 AM

 

Sorry to hijack this, but just reading through it and it got me thinking, I've used M10 stainless bolts to bolt the rear of the front subframe to the toe board, with nyloc nuts. Will these be suitable or shall I swap them out for graded mild ones, before it hits the road? The stainless ones have like 'A2-70' on the head.

 

 

No a good idea. The Tensile Strength of them ~~ may ~~ be OK, but it would be boarder line. Where you would run in to real problems though is that putting Stainless against ordinary steels causes the plain steel to rust like crazy. You can coat them is 'goop' of one kind or another it may help, but you won't know for sure. What I have seen of them though, even when it does work, it doesn't last.



#11 philip663

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Posted 05 January 2017 - 11:43 AM

Hey

 

I swopped my 7/16s out for some titanium ones i imported from america, these..

 

http://www.ti64.com/...ry-s/110782.htm



#12 MacGyver

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Posted 05 January 2017 - 05:06 PM

Hey
 
I swopped my 7/16s out for some titanium ones i imported from america, these..
 
http://www.ti64.com/...ry-s/110782.htm


😮 ...Woooooo... shiny!

#13 Mini Manannán

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Posted 05 January 2017 - 08:53 PM

You can get them in Ti in the UK: https://titanclassic...sic-mini-parts/  They are very shiny and nice but  :xxx: they're expensive!


Edited by Mini Manannán, 05 January 2017 - 08:54 PM.


#14 Plank

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Posted 08 January 2017 - 07:15 PM

I have seen several cars at shows with S/S bolts. It can be so dangerous due to lack of understanding.

Fasteners are so important as they hold everything together, but they are so often overlooked.

Non hardened bolts are rated 5 or below. "normal" bolts are usually 8.8 and hardened.

Bolts for holding stressed components on or together start at 10.9

Big end bolts, mains, head bolts, flywheel bolts etc etc are 12 plus.

S/S but the not shiny variant are used but usually studs for exhaust manifolds and turbos. How ever these are hardened hence not shiny.

If the bolt head to be used on a key component does not state its hardness.  Do not use it. 

Additionally the bolt maker must put their logo on the bolt head of certified bolts.  AA = Atlas Armstrong (Caparo)   B =  Brugola   etc etc



#15 lawrence

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Posted 09 January 2017 - 09:34 AM

Bit off topic but interesting nevertheless.

 

Is it worth making a sticky topic regarding stainless bolts of prevent misinformation being dispersed?






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