Lenovo ThinkPad L590 Hardware Maintenance Manual page 81

Step Screw (quantity)
3
M2 × 3.5 mm, flat-head, nylon-coated(2)
When installing:
Ensure that the I/O bracket is attached firmly.
Removal steps of the I/O bracket (for L590)
Step Screw (quantity)
1
M2.5 × 4.5 mm, flat-head, nylon-coated (3)
Color Torque
Black 0.181 Nm
(1.85 kgf-cm)
Color Torque
Silver 0.294 Nm
(3.0 kgf-cm)
.
Chapter 8 Removing or replacing a FRU
75