1 Reference information
1.4. Screw joints
153HAC023297-001 Revision: A
• Only use correctly calibrated torque keys.
•Always tighten the joint by hand, and never use pneumatical tools.
•Use the correct tightening technique, i.e. do not jerk. Tighten the screw in a slow,
flowing motion.
• Maximum allowed total deviation from the specified value is 10%!
The table below specifies the recommended standard tightening torque for oil-lubricated
screws with slotted or cross-recess head screws.
The table below specifies the recommended standard tightening torque for oil-lubricated
screws with Allen head screws.
The table below specifies the recommended standard tightening torque for Molycote-
lubricated screws with Allen head screws.
Dimension
Tightening torque (Nm)
Class 4.8, oil-lubricated
M2.5 0.25
M3 0.5
M4 1.2
M5 2.5
M6 5.0
Dimension
Tightening torque
(Nm)
Class 8.8, oil-
lubricated
Tightening torque
(Nm)
Class 10.9, oil-
lubricated
Tightening torque
(Nm)
Class 12.9, oil-
lubricated
M5 6 - -
M6 10 - -
M8 24 34 40
M10 47 67 80
M12 82 115 140
M16 200 290 340
Dimension
Tightening torque (Nm)
Class 10.9, Molycote-lubricated
Tightening torque (Nm)
Class 12.9, Molycote-lubricated
M8 28 34
M10 55 66
M12 96 115
M16 235 280