GENERAL INFORMATION
GENERAL PRECAUTIONS AND FITTING INSTRUCTIONS 3
Joints and joint faces
Fit joints dry unless otherwise specified in this
Manual.
If gaskets and/or jointing compound is
recommended for use; remove all traces of old
jointing material prior to reassembly. Do not use a
tool which will damage the joint faces and smooth
out any scratches or burrs on the joint faces using
an oil stone. Do not allow dirt or jointing material to
enter any tapped holes.
Prior to reassembly, blow through any pipes,
channels or crevices with compressed air.
Screw threads
Both UNF and metric threads to ISO standards are
used.
Damaged nuts, bolts and screws must always be
discarded.
Cleaning up damaged threads with a die or tap
impairs the strength and closeness of fit of the
threads and is not recommended.
Castellated nuts must not be slackened back to
accept a split-pin, except in those recommended
cases when this forms part of an adjustment.
Do not allow oil or grease to enter blind threaded
holes. The hydraulic action on screwing in the bolt or
stud could split the housing.
Always tighten a nut or bolt to the recommended
torque figure. Damaged or corroded threads can
affect the torque reading.
To check or re-tighten a bolt or screw to a specified
torque figure, first slacken a quarter of a turn, then
retighten to the correct torque figure.
Bolt identification
An ISO metric bolt or screw made of steel and larger
than 6 mm in diameter can be identified by either of
the symbols ISO M or M embossed or indented on
top of the head.
In addition to marks to identify the manufacturer, the
head is also marked with symbols to indicate the
strength grade, e.g. 8.8; 10.9; 12.9; 14.9. As an
alternative, some bolts and screws have the M and
strength grade symbol on the flats of the hexagon.
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