Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > General Motorcycles only > Stainless bolt replacement in calipers?

[Iconic944ss]

I'm thinking along the same lines myself Rich !!!

We were both involved in an earlier thread however ......

http://www.ducatisportingclub.com/xm....php?tid=16715

Study the words of Shazaam! wisely, grasshopper !!!

[Jasper]

Stealth,I'm not sure that the bolts that actually bolt the calipers together IS such a high stress area.Certainly not in "shear" which is where SS is weaker than conventional steel.If i go for Ti,as you say Poggipolini is the way forward,just that if high quality SS was as good,then that would do!!££££££££!!

[Iconic944ss]

Reading between the lines for a cheapo like me, it sounds like Cadmium plated steel or high tensile steel might be the way to go for the mounting bolts.

SS (A4 grade 80 as mentioned) might well be ok strength wise but the implication is that for long term use there might be a corrosion issue with Aluminium.

Frank

[Stealth]

happy to be corrected on the level of stress on caliper bolts - I just don't think I would leave it to any chance by having low tensile materials holding the buggers on.

strong is more important than shiny although .....if you can get get strong and shiny then...............................obviously time for my cocoa

[Jasper]

Stealth,i TOTALLY agree!When it comes to holding them on.I am actually talking about holding them TOGETHER,which(not being that clued up on metalurgy,or it's spelling!) doesn't seem to invoke the same levels of stress and therefore will allow a lower strenghth bolt ie SS.

Frank,i have used SS everywhere on all my Dukes and never had an issue with reaction between the metals.Maybe it's because they are not in long enough!!

[Stealth]

Oh... holding them together. Now I understand. Sorry - like I said time for cocoa.

What's wrong with glue?

[Iconic944ss]

Yes Jasp, having said all the above I've used SS bolts on my 6-pot calipers and have not had a problem - but, I've not had them apart either.
I used plenty of anti-sieze and didnt have any problems:

http://homepage.ntlworld.com/flsntl/...s/page0002.htm

I did use high tensile steel for the mounting bolts (and nyloc nuts - belt and braces eh?).

But I'll obviously need something more 'bling' for my P4's

Gold cadmium plating perhaps - LOL.....

Frank

[Jasper]

Frank,i may have some HIGH QUALITY Ti ones for you.Give me a ring.

[yeti]

Originally posted by Jasper
I am actually talking about holding them TOGETHER

Don't underestimate the amount of stress "holding them together" involves. If you try to think laterally, when you apply braking force to the caliper, the equal and opposite reaction is to try to force the calipers apart. Therefore the bolts "holding them together" are actually a high stress item. For my calipers, I used aircraft standard SS bolts, but got them through a now defunct source.

If you do a search on high tensile SS bolts, I'm sure you'll find something similar.

[HW]

Originally posted by yeti

Don't underestimate the amount of stress "holding them together" involves. If you try to think laterally, when you apply braking force to the caliper, the equal and opposite reaction is to try to force the calipers apart. Therefore the bolts "holding them together" are actually a high stress item. For my calipers, I used aircraft standard SS bolts, but got them through a now defunct source.

If you do a search on high tensile SS bolts, I'm sure you'll find something similar.

That's true, but it's a tensile stress, not shear in that instance. However, I don't know how stainless compares to titanium or steel in that respect.