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
0.25M2.5
0.5M3
1.2M4
2.5M5
5.0M6
Product manual - OmniCore V250XT Type B 427
3HAC087112-001 Revision: A
© Copyright 2023-2023 ABB. All rights reserved.
8 Reference information
8.5 Screw joints
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