Lenovo ThinkPad T490s Hardware Maintenance Manual page 99

Step Screw (quantity)
20
M2 × 3 mm, flat head, nylon-coated (4)
21
M2 × 2.2 mm, flat head, nylon-coated (2)
When installing: Ensure that the connectors are attached firmly.
ThinkPad X390
Color Torque
Silver 0.181 Nm
(1.85 kgf-cm)
Black 0.181 Nm
(1.85 kgf-cm)
.
Chapter 8 Removing or replacing a FRU
93