7.4 Screw joints
General
This section describes how to tighten the various types of screw joints on the IRB
120.
The instructions and torque values are valid for screw joints comprised of metallic
materials and do
not
apply to soft or brittle materials.
UNBRAKO screws
UNBRAKO is a special type of screw recommended by ABB for certain screw joints.
It features special surface treatment (Gleitmo as described below) and is extremely
resistant to fatigue.
Whenever used, this is specified in the instructions, and in such cases,
no other
type of replacement screw
is allowed. Using other types of screws will void any
warranty and may potentially cause serious damage or injury.
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.
Screws lubricated in other ways
Screws lubricated with Molycote 1000 should
only
be used when specified in the
repair, maintenance or installation procedure descriptions.
In such cases, proceed as follows:
1 Apply lubricant to the screw thread.
2 Apply lubricant between the plain washer and screw head.
3 Tighten to the torque as described in the procedures.
Article number
Lubricant
11712016-618
Molycote 1000 (molybdenum disulphide grease)
258
Product manual - IRB 120
3HAC035728-001 Revision: N
© Copyright 2009-2017 ABB. All rights reserved.
7 Reference information
7.4 Screw joints
Summary of Contents for IRB 120
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