User Manual QT series generation 2.5, ID 2021, rev 3.2, January 14, 2022
Lubricate threads with a lubricant giving friction coefficient between 0.08 to
0.14. To prevent galling when using stainless steel fasteners, a lubricant
containing MoS2 is recommended.
Stainless steel fasteners tend to gall while being tightened. The risk of
galling or thread seizing can be reduced by:
• Using recommended lubrication.
• Tighten the screws in the sequence indicated in the figure below.
• Tighten fasteners with low rpms, without interruptions.
• Apply only light pressure.
Figure 50: Tightening sequence for M4 screws
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