Corsair AF120 quiet edition

On a lot of new fans you're actually creating the screw grooves, so the first screw in is significantly more difficult than in future attempts.
 
It always take more pressure to screw in the first time. Use a #2 phillips as it will work better then a #1 phillips
 
Size of the head yes. I normally use a #1 when building a pc except for installing fans and I use #2.
 
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