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Glossary of Fastener Terminology
O
Octagon Head: A bolt or screw whose head cross
section is a regular polygon with 8 sides.
Oiled: Oiled is the term denoting the
application of a suitable corrosion retarding oil to
a fastener.
Overtapping: Tapping of a thread following a
plating operation so that the thread tolerances
comply within specification allowing the internal
and external threads to assemble. It is normal
practice to overtap the internal rather than the
external thread.
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