Lenovo ThinkPad X1 Carbon Hardware Maintenance Manual page 84

Step Screw (quantity)
20
M2 × L5 mm, flat-head, nylon-coated (5)
21
M2 × L2.5 mm, flat-head, nylon-coated (4)
78
Hardware Maintenance Manual ThinkPad X1 Carbon and X1 Yoga
20
20
20
21
21
19
19
21
20
21
20
Color
Black
Black
Torque
0.181 Nm
(1.85 kgf-cm)
0.181 Nm
(1.85 kgf-cm)