HP Compaq nc6220 Maintenance And Service Manual page 183

Screw Listing
mm
Where used:
2 screw locks that secure the serial connector module to the notebook
(documented in
Hex Socket HM5.0×11.0 Screw Lock Locations
C–20
Hex Socket HM5.0×11.0 Screw Lock
Color
Silver
Section 5.22)
Table C-12
Qty. Length
4 11.0 mm
Maintenance and Service Guide
Head
Thread Width
2.5 mm 5.0 mm