THREAD LOCKING
LOCKED IN
18
www.fastening-solutions.co.uk
AUTUMN 2019
Threaded assemblies are the most
important detachable parts
used in machinery construction,
installation and repair. Relaxation of
tension and self-loosening is common
for any machine but when it is
operating in harsh environments, the
need to minimise this deterioration
not perform well under extreme conditions.
Locking devices, such as tooth flanged and
ribbed flanged bolts, nuts and washers are
effective at preventing self-loosening but
can damage the contact surface, need larger
flange-bearing surfaces and are expensive.
Increasingly, thread locking adhesives are
taking the place of traditional mechanical
locking devices because they deliver the
greatest all-round efficiency, especially when
the going gets tough. As well as preventing
unwanted movement, loosening, leaks and
How to achieve the best clampload retention
performance in extreme conditions.
with effective thread locking is even
more important. Various methods are
available but what are their respective
strengths and failings?
Mechanical devices such as split pins and
tab washers are only suitable for preventing
the loss of nuts and bolts. Friction devices
give some resistance to vibration but do
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