It is kind of funny that most ceiling fans are actually held up by the two 8-32 screws going into the celing box, even though we take great measure to hold the box securely in place.
All of the ceiling fans I've ever hung come with 10-24 bolts, not 8-32. Now, some of the boxes are dual-rated for both 10-24 and 8-32, but for ceiling fans 99% of the time the manufacturer suggests using the 10-24's provided.
