GENERAL INFORMATION
GENERAL PRECAUTIONS AND FITTING INSTRUCTIONS 5
Self-locking bolts and screws
Self-locking bolts and screws, i.e. nylon patched or
trilobular thread can be re-used providing resistance
can be felt when the locking portion enters the
female thread.
Nylon patched bolts and screws have a locking
agent pre-applied to the threads. They are identified
by the presence of a coloured section of thread
which extends for up to 180° around the thread.
Trilobular i.e. Powerlok bolts have a special thread
form which creates a slight interference in the
tapped hole or threads of the nut into which it is
screwed.
DO NOT re-use self-locking fasteners in critical
locations eg engine bearings flywheel. Always use
the correct replacement self-locking nut, bolt or
screw.
DO NOT fit non self-locking fasteners in applications
where a self-locking nut, bolt or screw is specified.
Encapsulated bolts and screws
Encapsulated bolts and screws have a
micro-encapsulated locking agent pre-applied to the
thread. They are identified by the presence of a
coloured section of thread which extends completely
around the thread - 360°. The locking agent is
released and activated by the assembly process and
is then chemically cured to provide the locking
action.
Unless a specific repair procedure states otherwise,
encapsulated bolts may be re-used providing the
threads are undamaged and the following procedure
is adopted.
Remove loose adhesive from the bolt and housing
threads, ensure threads are clean and free of oil and
grease. Apply an approved adhesive.
Fit a new encapsulated bolt, or if not available a bolt
of equivalent specification treated with an approved
adhesive.
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