Lenovo ThinkPad S431 Hardware Maintenance Manual page 97

Removal steps of hinges
Step Screw (quantity)
1
M2.5 × 2.5 mm, wafer-head, nylon-coated (4)
2
M2.5 × 4 mm, wafer-head, nylon-coated (2)
Color Torque
Silver 0.196 Nm
(2.00 kgf-cm)
Black 0.196 Nm
(2.00 kgf-cm)
.
Chapter 9 Removing or replacing a FRU
91