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Glossary of Fastener Terminology
U
U
Bolt: A U shaped fastener threaded at both ends
used primarily in suspension and related areas of
vehicles.
UNC: The
designation describing Unified National Coarse
threads.
UNF:
The designation describing Unified
National Fine threads.
Ultrasonic Extensometer: An instrument which can
measure the change in length of a fastener
ultrasonically as the fastener is tightened (or
measure the length before and after it is
tightened).
Unfinished Fastener:
An unfinished fastener is a fastener
made to the same basic dimensions as a finished
fastener but having relatively wider tolerances than
a finished fastener and having all surfaces in their
formed condition.
Upsetting: Upsetting is the
process of increasing the cross sectional area by
displacement of material longitudinally and radially.
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