I did see the general manual, and they say to tighten all bolts. This is far from the correct way to tighten the bolts.
I see far to many pilots use their full force to tighten the bolts, compressing a wood prop way too much.
The bolts, including the center nut, should be very lightly tightened in a criss-cross pattern going round and round until all bolts hold their torque.
I cannot tel the torque, because I use my engineer's feeling. All I know is that the final torque is way below the thread damage torque. When I am done, a medium hardness grade wood prop will have compressed very slightly.
When the engine heats the wood, it will compression set again, so re-torquing is required. The heat also hardens the wood, so torquing frequencies will become less and less.
One of these days I will buy a suitable torque wrench, so I can check the final torque in my applications. I doubt it will be more thanthree foot-pound on M5 screws.

edit PS:
M5 10.9 high grade bolts have 6.7 Nm standard torque (lubed threads). That is about 5 LbFt, which would certainly compress your prop to death.