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Tightening torque
Before tightening any screw, note the following:
The table below specifies the recommended standard tightening torque for oil-lubricated
screws with slotted or cross-recess head screws.
Dimension
3HAC022033-001 Revision: E
•
Determine whether a standard tightening torque or special torque is to be applied.
The standard torques are specified in the tables below. Any special torques are
specified in the Repair, Maintenance or Installation procedure descriptions. Any
special torque specified overrides the standard torque!
•
Use the correct tightening torque for each type of screw joint.
•
Only use correctly calibrated torque keys.
•
Always tighten the joint by hand, and never use pneumatical tools.
•
Use the correct tightening technique, that is do not jerk. Tighten the screw in a slow,
flowing motion.
•
Maximum allowed total deviation from the specified value is 10%!
Tightening torque (Nm)
Class 4.8, oil-lubricated
M2.5
0.25
M3
0.5
M4
1.2
M5
2.5
M6
5.0
7 Reference information
7.4. Screw joints
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