Lenovo MT 1842 Manual page 122

Removing and replacing a FRU
Screws 11 are only for the models with 15.0-in. LCD. For
the other models, skip the step.
Step Screw (quantity)
11
M2 × 10 mm, flat-head,
nylon-coated (4)
12
M2 × 3 mm, small-head,
nylon-coated (2)
13
M2 × 6 mm, bind-head,
nylon-coated (1)
116
R50e and R52 Series
11
11
12
13
14
Color
Black
Black
Black
Torque
0.245 Nm
(2.5 kgfcm)
0.245 Nm
(2.5 kgfcm)
0.245 Nm
(2.5 kgfcm)