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%
!
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.
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
140
115
82
M12
340
290
200
M16
670
560
400
M20
1150
960
680
M24
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Product manual - IRB 6790
649
3HAC063331-001 Revision: B
© Copyright 2019 - 2020 ABB. All rights reserved.
7 Reference information
7.4 Screw joints
Continued
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