Lenovo ThinkPad T420 Hardware Maintenance Manual page 90

Step Screw (quantity)
M2 × 3 mm, wafer-head, nylon-coated (1)
3
Shoulder screw (2)
4
84
ThinkPad T420 and T420i Hardware Maintenance Manual
Torque
Color
Black 0.181 Nm
(1.85 kgfcm)
Silver 0.181 Nm
(1.85 kgfcm)