Brake Rotor Bolt (Screw DIN 912 - M 8 x 20 - 10.9 Precote 85)

This is the factory screw for holding the rear brake rotor to the hub adapter.

M8 x 1.25 thread pitch, 20 mm long. Class 10.9. Zinc-plated steel, with factory-applied Precote 85 thread locking coating.

Takes a 6 mm socket driver (Allen key). 

Used to attach the rear brake rotor to the hub adapter. Torque spec is 30 Nm (22 ft-lb).

You'll need 5 if you want to replace all of them.

Or you can get the uncoated bolts and apply your own Loctite.