HP 4310s - ProBook - Core 2 Duo 2.1 GHz - Phillips PM2.0×4.0 Screw

7–10 Maintenance and Service Guide
Screw listing
Phillips PM2.0×4.0 screw
Where used: 3 screws that secure the optical drive bracket to the optical drive
Color Quantity Length Thread Head diameter
Black 13 4.0 mm 2.0 mm 4.5 mm