Lenovo ThinkPad T490s Hardware Maintenance Manual page 103

Table 16. Screw specification (ThinkPad X390)
Step Screw (quantity)
1
M 2.5 × 4.5 mm, flat-head, nylon-coated (6)
When installing: Ensure that the connectors are attached firmly.
Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause
the cables to be damaged by the cable guides, or a wire to be broken.
Color Torque
0.294 Nm
Silver
(3.0 kgf-cm)
.
Chapter 8 Removing or replacing a FRU
97