4 Repair
4.1.5 Instructions for tightening Screw Joints
64 3HAC021111-001 Revision: B
4.1.5 Instructions for tightening Screw Joints
General It is extremely important that all screw joints are tightened using the correct torque.
Application The following tightening torques must be used, unless otherwise specified in the text, for all
screw joints made of metallic materials.
The instructions do not apply to screw joints made of soft or brittle materials.
For screws with a property class higher than 8.8, the same specifications as for class 8.8. are
applicable, unless otherwise stated.
Screws treated
with Gleitmo
All screws in the manipulator that are tightened to a specified torque are treated with Gleitmo.
When handling screws treated with Gleitmo, protective gloves of nitrile rubber type should
be used.
Screws treated with Gleitmo can be unscrewed and screwed in again 3-4 times before the slip
coating disappears. Screws can also be treated with Molycote 1000.
When screwing in new screws without Gleitmo, these should first be lubricated with Moly-
cote 1000 and then tightened to the specified torque.
Assembly Screw threads sized M8 or larger should preferably be lubricated with oil. Molycote 1000
should only be used when specified in the text.
Screws sized M8 or larger should be tightened with a torque wrench, if possible.
Screws sized M6 or smaller may be tightened to the correct torque by personnel with suffi-
cient mechanical training, without using torque measurement tools.
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