Section 1 of the Cb500/550 Shop manual, shows the torque specs for the 6 x 20 clutch bolts are 1.0-1.4 Kg-m or 7.2-10.1 Ft lbs.
The bolts must be screwed in evenly so as not to warp or break the mechanism. So, don't put all that torque on just one bolt all at once. Twist each one a turn or two and move on to the next until all are at torque spec. I like to use a criss cross pattern.
Cheers,