IBM THINKPAD S05L-1270-01 - Manual (Page 184)

Step Length (Quantity) Torque
4 4 mm, Nylon (2) 4.0 kgcm
Note: Make sure you use the correct screw and tighten it to
the torque specified. Do not use the screw that you removed,
use a new screw.
172 IBM Mobile Systems HMM