for the shiny fasteners

[Petrus]

in a response to replacing fasteners with stainless steel it was observed that these alloys tend to be a bit more brittle.
I now have a typical practical real world example on hand: The spokes in the wheels of my sidecar are in stainless steel. This is the default nowadays because shiny. They are way more prone to breaking though.
In the rear wheel of mine there are super heavy duty 4.0 mm spokes whereas OEM is 3.65 but since stainless these still can and will break.

Annealing the spokes at moderate temp will gréatly improve resistance by relieving manufacturing stresses. About 250 degrees C. for 20 minutes and slow air cooling will do it  for these spokes. Still not as resilliant as normal galvanised spokes though.

I hópe to be able to get the 4.0 mm spokes in the proper tough steel but it seems all is bling now 

This applies to all fasteners too.
Just be aware and in case of doubt stress relieve the bits.