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7 Reference information
7.4. Screw joints
391
3HAC022033-001 Revision: E
©
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4 - 20
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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 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%
!
The table below specifies the recommended standard tightening torque for
oil-lubricated
screws
with
slotted or cross-recess 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
Continued
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Содержание IRB 7600 - 500/2.55
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