©
200423
1-1
Threaded connections
THREADED CONNECTIONS
ΧΦ85 series
2
1. THREADED CONNECTIONS
1.1 GENERAL
The components may have threaded connections
that have been treated with lubricant (dipped
threaded connection). Galvanised bolts and nuts
are wax dipped in the factory. Black annealed
and phosphatised bolts and nuts are oil dipped.
The advantage of using dipped nuts and bolts is
that friction during tightening is reduced, so that
the specified pre-tension force can be accurately
obtained. The tightening torque can be reduced
while the pre-tension force remains the same.
To achieve a small spread in the pre-tension
force, the dipped threaded connection must be
tightened accurately.
Therefore, always use a reliable torque wrench
that provides a high degree of accuracy.
Note:
Have torque wrenches regularly inspected and
calibrated.
Re-use of fasteners (bolt/nut/threaded end)
1.
Clean the thread (take particular care to
remove locking compound residues) and the
clamping faces
2.
Check the thread for damage.
To do so, manually screw a new nut/bolt onto
the thread to be checked.
If the new nut/bolt cannot be fully hand-
screwed onto the entire thread of the
fastener to be checked, the fastener is not
allowed to be re-used.
3.
Apply one drop of engine oil to the upper turn
of the bolt (threaded end)/lower turn of the
nut and one drop to the clamping faces
(other lubricants are not allowed).
4.
If a locking compound has been specified, oil
should not be applied to the thread.