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cyril
 Post subject: Stainless Torx
PostPosted: 28 Jun 2011 17:55 
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Are stainless torx available for brake disc fixings on a Ully ? Thanks in advance.
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pash
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 18:26 
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cyril wrote:
Are stainless torx available for brake disc fixings on a Ully ? Thanks in advance.


Never seen aftermarket SS torx fasteners, but that aside, I don't think it is too wise to use them for brakes...

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Adam
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 19:18 
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I'd agree that stainless in shear probably isn't the best material for these bolts.

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MadRat
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 20:02 
Adam wrote:
I'd agree that stainless in shear probably isn't the best material for these bolts.


:?:
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thorkill the tall
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 20:29 
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The Ducati WSB team use 316 (A4) stainless bolts for their disc rotors, supplied by Probolt.
316 has greater tensile strength, proof stress and elongation qualities than ordinary ferrous bolts.

I wouldn't use 'normal' A2 stainless bolts in a stress crucial application.

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panther
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 20:47 
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www.palmerproducts.co.uk
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pash
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 22:04 
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thorkill the tall wrote:
The Ducati WSB team use 316 (A4) stainless bolts for their disc rotors, supplied by Probolt.
316 has greater tensile strength, proof stress and elongation qualities than ordinary ferrous bolts.

I wouldn't use 'normal' A2 stainless bolts in a stress crucial application.


Erm, am I missing something here? UTS (Ultimate Tensile Strength) of 316 Stainless is around 500MPa whereas the UTS of High Tensile Steel (Allen screws with 12.9 stamped in them) is 1200MPa. Even SAE Grade 8 bolts (6 radial lines on the head of a hex bolt) as used on critical fasteners on Buells (brake rotors / front isolators) are over 1000MPa...

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thorkill the tall
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 22:21 
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Erm... I'm not even going to bother.
Maybe I'll bother to argue the point at this year's Calne.

Enjoy this weekend.

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pash
 Post subject: Re: Stainless Torx
PostPosted: 28 Jun 2011 22:25 
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I was looking for enlightenment not an argument... :ugeek:

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WILLYBUELL
 Post subject: Re: Stainless Torx
PostPosted: 29 Jun 2011 00:22 
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pash wrote:
cyril wrote:
Are stainless torx available for brake disc fixings on a Ully ? Thanks in advance.


Never seen aftermarket SS torx fasteners, but that aside, I don't think it is too wise to use them for brakes...

BUGGER my one of set of A2 disc rota bolts have been on for over 140000 miles .poped a stope on sunday still ok dude :shut: :rofl: :yup:

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drillmastertommy
 Post subject: Re: Stainless Torx
PostPosted: 29 Jun 2011 09:25 
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BUGGER my one of set of A2 disc rota bolts have been on for over 140000 miles .poped a stope on sunday still ok dude :shut: :rofl: :yup:


You had me head scratching for a minute there! ......... A2, A4, high tensile yada yada.... I was stuck with wondering what a stope was! And more to the point how you pope one!!
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rik
 Post subject: Re: Stainless Torx
PostPosted: 29 Jun 2011 10:28 
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drillmastertommy wrote:
Quote:
BUGGER my one of set of A2 disc rota bolts have been on for over 140000 miles .poped a stope on sunday still ok dude :shut: :rofl: :yup:


You had me head scratching for a minute there! ......... A2, A4, high tensile yada yada.... I was stuck with wondering what a stope was! And more to the point how you pope one!!



:D Maybe he's a coper....

sacheus wrote:
Thought the POLICE were NOT above the law? so how fast was he going? being a coper I would have thought he should have known what white lines are...


:sp: :sp:

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ant69
 Post subject: Re: Stainless Torx
PostPosted: 30 Jun 2011 10:24 
pash - tensile strength and shear strength are not necessarily the same thing; materials can behave differently depending on the direction and application of force.

you are not trying to stretch rotor bolts, you are trying to snap their ends off
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pash
 Post subject: Re: Stainless Torx
PostPosted: 30 Jun 2011 10:49 
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Indeed, in use you are trying to shear them, to cut through them, however I was responding to TtT's point about the material properties of 316.

In actual fact, I think you will find that the limit on how tight you can do a stainless Allen screw up for a disc will be a close run thing between rounding off the internal hex on the head and stripping the thread in the casting...

You probably know more about material properties than I...

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ant69
 Post subject: Re: Stainless Torx
PostPosted: 01 Jul 2011 16:48 
pash - doh - sorry ( and, anyway why am i trying to teach granny to suck eggz ? )

my materials science is almost 35 yrs out of date.
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