but as I remember form my old DF days, these bolts were not available off the shelf. I know cause I looked.

The head has to be exteremly hard to withstand the torque of starting witht he somewhat sever angularity associated with some of the installs.

And it you round off the bolt enough to have a problem getting the bolt out of your fan, your would pay the 9 bucks in a heartbeat to avoid the hassle.

I give up!