ABB IRB 140 type C Product Manual page 180

7 Reference information
7.3. Screw joints
Continued
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
The table below specifies the recommended standard tightening torque for oil-lubricated
screws with Allen head screws.
Dimension
M5
M6
M8
M10
M12
M16
The table below specifies the recommended standard tightening torque for Molycote-
lubricated screws with Allen head screws.
Dimension
M8
M10
M12
M16
178
• 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 description. Any special torque
specified overrides the standard value.
•
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
Tightening torque
(Nm)
Class 8.8,
oil-lubricated
6
10
24
47
82
200
Tightening torque (Nm)
Class 10.9, Molycote-lubricated
28
55
96
235
Tightening torque Tightening torque
(Nm) (Nm)
Class 10.9, Class 12.9,
oil-lubricated oil-lubricated
- -
- -
34 40
67 80
115 140
290 340
Tightening torque (Nm)
Class 12.9, Molycote-lubricated
34
66
115
280
3HAC027400-001 Revision: C
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