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3 Screw dimensions of M8 or larger must be tightened with a torque wrench.
Screw dimensions of M6 or smaller may be tightened without a torque wrench
if
this is done by trained and qualified personnel.
Article number
Lubricant
3HAC042472-001
Molykote 1000 (molybdenum disulphide grease)
3HAC070875-001
Molykote P1900 (molybdenum disulphide grease)
Tightening torque
Before tightening any screw, note the following:
•
Determine whether a
standard
tightening torque or
special
torque is to be
applied. The
standard torques
are specified in the following tables. 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 pneumatic 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 for oil-lubricated screws with slotted or cross-recess head screws
The following table specifies the recommended standard tightening torque for
oil-lubricated screws
with
slotted or cross-recess head screws.
Note
A special torque specified in the repair, maintenance or installation procedure
overrides the standard torque.
Tightening torque for oil-lubricated screws with allen head screws
The following table specifies the recommended standard tightening torque for
oil-lubricated screws
with
allen head screws.
Note
A special torque specified in the repair, maintenance or installation procedure
overrides the standard torque.
Tightening torque (Nm)
Class 12.9, oil-lubric-
ated
Tightening torque (Nm)
Class 10.9, oil-lubric-
ated
Tightening torque (Nm)
Class 8.8, oil-lubricated
Dimension
-
-
6
M5
-
-
10
M6
40
34
24
M8
80
67
47
M10
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Product manual - IRB 6720
625
3HAC085697-001 Revision: C
© Copyright 2023 ABB. All rights reserved.
9 Reference information
9.4 Screw joints
Continued
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