HP Compaq NC6140 Maintenance And Service Manual page 202

Screw Listing
mm
Where used:
1 screw that secures the system board to the computer (documented in
Section 6.25)
Torx8 T8M2.5×4.0 Screw Location
C–20
Torx8 T8M2.5×4.0 Screw (Continued)
Color
Black
Table C-10
Qty. Length
7 4.0 mm
Maintenance and Service Guide
Head
Thread Width
2.5 mm 4.0 mm