HP TC4400 - Manual (Page 177)

Screw Listing
Maintenance and Service Guide A–19
Torx8 T8M2.5×8.0 Screw Locations
Table A-8
Torx8 T8M2.5×8.0 Screw
Color Qty. Length Thread
Head
Width
Black 4 8.0 mm 2.5 mm 4.0 mm
Where used:
4 screws that secure the heat sink to the tablet PC (documented in
Section 5.11 )
mm