8.5 Screw joints
General
This section details how to tighten the various types of screw joints on the controller.
The instructions and torque values are valid for screw joints comprised of metallic
materials and do
not
apply to soft or brittle materials.
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
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
, 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 heads.
Tightening torque (Nm)
Class 4.8, oil-lubricated
Dimension
0.25
M2.5
0.5
M3
1.2
M4
2.5
M5
5.0
M6
Product manual - OmniCore C90XT
425
3HAC073706-001 Revision: E
© Copyright 2020-2021 ABB. All rights reserved.
8 Reference information
8.5 Screw joints
Summary of Contents for OmniCore C90XT
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