4 Repair
4.2.3. Screw joints
3HAC030005-001 Revision: -114
© Copyright 2006 ABB. All rights reserved.
4.2.3. Screw joints
General
This section details how to tighten the various types of screw joints on the robot.
The instructions and torque values are valid for screw joints comprised of metallic materials
and do not apply to soft or brittle materials.
Gleitmo treated screws
Gleitmo is a special surface treatment to reduce the friction when tightening the screw joint.
Screws treated with Gleitmo may be reused 3-4 times before the coating disappears. After this
the screw must be discarded and replaced with a new one.
When handling screws treated with Gleitmo, protective gloves of nitrile rubber type should
be used.
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 Allen head screws.
Dimension
Tightening torque
(Nm)
Class 8.8, oil-lubri-
cated
Tightening torque
(Nm)
Class 10.9, oil-lubri-
cated
Tightening torque
(Nm)
Class 12.9, oil-lubri-
cated
M5 6 - -
M6 10 - -
M8 24 34 40
M10 47 67 80
M12 82 115 140
M16 200 290 340
M24 725 960 1150
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