Simrad ES333-7CD - REV A, Installation Manual, Page: 17 / 32

Transducer handling and maintenance
necessary to involve a secondary locking device (e.g. chemical,
nylon or mechanical). The
Emuge self-lock
bolts withstand
vibrations better than standard (metric) threads, because the
thread contact stops the sideways movement. The special
design of the internal thread profile also provides a more even
distribution of the tightening stress over the whole thread length.
The assembly is just as easy as with a normal (metric) thread.
There is no general applicable standard (e.g. DIN standard) for
the
Emuge self-lock
thread.
Figure 5 Example, internal and external threads
A B C
2
1
(CD017020B)
A Emuge’s saw-tooth profile up to pitch P ≤ 0.7 mm
B
Emuge’s saw-tooth profile up to pitch P ≥ 0.7 mm
C Standard thread
1 External thread
2 Internal thread
The advantages of using
Emuge self-lock
thread include:
• The thread locking feature is integrated in the internal thread
• Modified profile with ramp surface in the direction of stress
• 30 degree ramp surface provides self-locking effect
• Easy assembly
• No assembly errors (forgetting the locking device) possible
• Use of standard external threads (screws) with tolerance class
“medium”
• Even distribution of stress over the whole thread length
• No stripping of threads
• Economically efficient locking system, no additional
components are necessary
• Undiminished holding power even under dynamic stress
• Repeated loosening and re-tightening without loss of function
329787/A
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