Can't tell if fasteners are aluminium or titanium.

Hi all,

Doing some maintenance and have removed the rear disc and sprocket. The sprocket nuts and disc bolts are too light to be steel so I suspect they are titanium or aluminium. Only issue is that i'm not sure which torque settings to use when refitting as aftermarket aluminium are less?

I guess the right answer is to buy new ones but I don't want to throw away some nice titanium fasteners if that's what I have.

Anyone know of a non destructive way of figuring out if they are titanium or aluminium?

Thanks,

Paul

 

The titanium will be machined so a lot crisper edging to them and will look a lot better quality than the aluminum.

 

Added a couple of pictures. I think you can see machining marks?

 

Looks titanium to me mate as sharper edging compared with the Ali ones I’ve seen, Google race bolt and have a look.

 

Cheers. I noticed when I was googling that m10 aluminium sprocket nuts in general take a 16mm socket and titanium take a 14mm. So happy that its titanium based on that and the quality comparison.

 

Titanium is generally a darker colour to aluminium looks similar to stainless, I would assume no one would put alloy bolts in discs