This is the little screw mainly used on Laptop, WiFi cards, M.2 SSD NVMe Heatsink, Screen Brackets, Multi io Boards, Webcams, Keyboards, and even some Palmrests and Base plastics.
Specification:
Material: Steel
Finish: Nickel Plated
Groove Type: Phillips Thread
Shoulder Diameter: 1.85~1.98 mm
Shoulder Length(Not included head): 4mm
Thread size: M2 x 4mm Thread
Thread Pitch: 0.4 mm / 0.016"
Head Diameter: 4.0~4.3 mm
Head Thickness (Head Height): 0.7~0.8 mm