Lenovo ThinkPad T420 Hardware Maintenance Manual page 104

Step Screw (quantity)
Capture shoulder screw (4)
1
M2 × 3 mm, wafer-head, nylon-coated (1)
2
For Discrete Graphics models:
98
ThinkPad T420 and T420i Hardware Maintenance Manual
1a
1c
1b
3
1d
Torque
Color
Silver 0.181 Nm
(1.85 kgfcm)
black 0.181 Nm
(1.85 kgfcm)
4