Sugino Messenger chainring bolts?
 

Anyone know what the torque specs are for the Sugino Messenger crankset? I have a Park Tool torque guide but I'm not sure whether the bolts are steel or aluminum.

UPDATE

Looks like these are the bolts that came with my crankset. It lists the nut as steel and the bolt as duralumin. Not sure whether that means I should go by the steel torque specs or the aluminum. I'm assuming aluminum to play it safe.

UPDATE 2

Torqued to 70 inch lbs and didn't damage the bolts. Gonna keep it there for now.

Just tighten them.

Seriously. You're only going to be able to tighten them so much holding the backs in place with a chainring bolt spanner tool anyway.

Duraluminum... .I'm shocked, and awed.

When in doubt, Rockwell hardness test (or a magnet).

Wait... why didnt that guy hella long ago with the ****ty mtb just use a magnet? what a dick.

His magnets were all being stored in a time capsule for later use.

You just summarized that whole thread.

The way to tell if the bolts are steel or aluminum is by putting something magnetic to it. If the bolt is magnetic, it is steel and if it is not, then it is aluminum. The torque for a steel crank bolt is 9 to 11 nM. No idea what torque aluminum bolts are. :thumb:

...or stainless steel...or titanium are also non-magnetic. Anyways, I hate using aluminum for any bolts or screws. Even if the threads don't strip out, then the hex sockets will and the only ones that are reliable use a Torx key to tighten them. The weight savings are negligible.

Pedantic metal guy to the rescue.

that was my first thought about aluminum bolts, but this is duraliminum!!!!!!! Which I have no experience with.