Lenovo T420 - Manual (Page 104)

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