Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > General Motorcycles only > Stainless steel front disc Allen bolts?

[sparkin]

Originally posted by moto748
Anyone fitted them?

I have a set ready to fit, but haven't put them on yet.

I should say, I am aware of two things: the possible danger of "cathodic" corrosion from dissimilar metals (largely overcome by the application of Copaslip, IMO), and, secondly, the fact that stainless steel is less strong than the steel that bolts (and especially allen screws) are normally made from.
(Contrary to that, I'm also aware that in some circumstances, the plating process on "ordinary" steel bolts can do damage which can seriously reduce the strength of the fasteners. This *ought* not to happen, if the correct de-embrittlement processes are carried out...)

I am a design engineer by trade, and had actually wondered about doing a basic fatigue analysis. Only thing I'd need to know is the actual braking force (in kg or whatever). If anyone has any data on this, I'd be grateful to hear it.

My gut feeling, however, is that whatever shear stress is induced in the bolts by the the couple of the braking effect, it is fairly small and nowhere near the yield stress of even 316 stainless.

So has anyone fitted stainless bolts here, or have any other useful data/comments? I'd be interested to hear.


[edit]
I'd also add that I'd guess that the full strength of the stock fasteners (Grade 12.9?) would be unlikely to be fully utilised, becasue the tapping in the hub would probably fail before the screws did.

[Edited on 26-2-2005 by moto748]

You said it yourself "and, secondly, the fact that stainless steel is less strong than the steel that bolts (and especially allen screws) are normally made from"

Titanium works thou