On normal electrical boxes screws are usually 6 32.
Ceiling fan mounting box screws.
4 2 out of 5 stars 78.
The box must be mounted firmly either by attaching it directly to a framing member or by using a fan rated brace.
This being a bit light for a fan also expect 8 32 or 10 32.
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You can also use a rod system adjusting the position of the box on the rods and then screwing the rods to the joists.
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First this has to be a properly installed ceiling fan box you can t put a fan on a lamp box because the dynamic forces of the vibration will tear it out of the ceiling.
Ground screws are 10 32.
Either way the front edge of the box should emerge through the ceiling flush.
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Most building codes require ceiling fans to be mounted on special fan rated boxes which are made of metal or strong plastic and have deep threaded holes for the mounting screws.