Trilogy Crank Pulley Bolts

[FF1077]

I need to buy 3 new bolts for the Trilogy crankshaft pulley.
According to the manual I need 3 M10 1.5x50mm Socket Hexagon Head Bolts.
What is the minimum hardness I need, or should I just get them as hard as possible.
I think my local hardware store has them in 12.9.
Thanks.

[LANDY]

Always get the best! Remember it will be spinning thousands of rpms.

[RubberCtyRauder]

12.9 is the highest metric grade listed

[FF1077]

Anyone know what the Pulley Bolts need to be torqued down to?
I cant find it in the manual I have.

[myrodr]

cobra crank blower pulley bolts are 74 lbs i think

[Siege]

The recommended torque for a M10 12.9 fastener is 57 ft/lbs.

I torqued mine to 50 ft/lbs and used red thread locker.

[FF1077]

Yikes.
I think I over did it then. I tightened them until the pulley started to rotate.

[justbob]

I tightened mine down tight with no thread locker... Over three years ago.

Sent from my Ally while ruling the world from my toilet.