Repairs General Description
Product Manual IRB 640 9
1.4 Instructions for Tightening Screw Joints
General
It is of the utmost importance that all screw joints be tightened with the correct torque.
Application
The following tightening torques are to be used for all screw joints in metallic materials
unless otherwise specified in the text.
These instructions do not apply to screw joints comprising soft or brittle materials.
For screws with a higher property class than 8.8, the data for 8.8 must be used unless
otherwise specified.
Screws treated with Gleitmo (lubricated)
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 that are not Gleitmo treated, these should first be lubri-
cated with Molycote 1000 and tightened to the specified torque.
Assembly
Lubrication with molybdenum disulphide grease (Molycote 1000) should only be used
when specified in the text.
Screws lubricated with Molycote 1000 and then torque tightened, should also to be
lubricated between the washer and the head of the screw.
Screws with dimension M8 or larger should be tightened with a torque-wrench, if pos-
sible.
Screws with dimension M6 or smaller may be tightened to the correct torque using
tools without
torque indication, by personnel with adequate mechanical training and
instruction.
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