Lenovo ThinkStation P3 Ultra Hardware Maintenance Manual page 72

4. Install the system fan.
Attention: Use the screws provided by Lenovo to avoid any unpredictable damage to your computer.
Step Screw (quantity)
2
M3 x L5 mm, countersunk screw (1)
3
M3 x L17.4 mm, flat-head (4)
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ThinkStation P3 Ultra Hardware Maintenance Manual
Color Torque
Blue Zn 5.0±0.1 in-lbs
Bright Ni 3.0±0.1 in-lbs