IBM X23 - Manual (Page 100)

XGA for X22, X23, X24
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Step Screw (quantity) Torque
1 M2 × 3.5mm (5) BK 19.6 Ncm (2 kgfcm)
2 M2.6 × 4mm (2) BK 29.4 Ncm (3 kgfcm)
Step Screw (quantity) Torque
5 M2 × 3mm (4) WH 19.6 Ncm (2 kgfcm)
96 ThinkPad X20, X21, X22, X23, X24