IBM X23 - Manual (Page 94)

For X22, X23
1
Step Screw (quantity) Torque
1 M2 × 3.5mm (1) Silver 19.6 Ncm (2 kgfcm)
For X24
1 2
Step Screw (quantity) Torque
1 M2 × 3.5mm (1) Silver 19.6 Ncm (2 kgfcm)
2 M2 × 3mm (1) White 19.6 Ncm (2 kgfcm)
90 ThinkPad X20, X21, X22, X23, X24