Introduction to Emuge self-locking threads
Emuge self-lock is a tap design with an integrated locking feature. Standard metric bolts are used. The internal thread provides a self-locking connection, which can be used repeatedly. It is not necessary to involve a secondary locking device (for example chemical, nylon or mechanical). The Emuge self-lock bolts withstand the vibrations better than standard (metric) threads, because the thread contact stops
the sideway 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.
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Emuge’s saw-tooth profile up to pitch P ≤ 0.7 mm |
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Emuge’s saw-tooth profile up to pitch P >0.7 mm |
The advantages of using Emuge self-lock thread include:
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The thread locking feature if integrated in the internal thread |
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Modified profile with ramp surface in the direction of stress |
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30° ramp surface provides self-locking effect |
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No assembly errors (forgetting the locking device) possible |
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Use the standard external threads (screws) with tolerance class "medium" |
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Even distribution of stress over the whole tread length |
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No stripping of threads |
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Economically efficient locking system, no additional components are necessary |
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Undiminished holding power even under dynamic stress |
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Repeated loosening and re-tightening without loss of function |
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Internal threads can be produced with Emuge taps, cold forming taps or thread milling cutters |
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Larger thread hole diameters, i.e. increased tool life for threading tools |
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Larger tolerance for thread hole diameters |
Drawing standard
Whenever self-locking threads are required, this is shown on the technical drawing. In the case of tapping through holes, the arrow at the end of the center line illustrates the screw-in direction of the bolt.
The drawing is normally provided with the following - or similar - text: Drill diameters for threads differ from standard. Self-lock taps can be supplied by Kongsberg Maritime.
NoteRefer to manufacturer’s website for the latest drawings and information about the self-locking taps. The illustrations and information provided here is for reference only.
Taps
The pretension locking thread self-lock (taps) from manufacturer Emuge must be used.
NoteIn case of tapping through holes it is important that the profile of the Emuge self-lock threads is in the correct direction
compared with the entering direction of the bolt.
Gauge
Use Emuge self-lock gauges. Note that the gauge must be used in the correct direction.
Self-lock taps provided by Kongsberg Maritime
Several self-lock taps are on stock at Kongsberg Maritime, and can be ordered from us.
Threads |
Drill diameter for threads |
Part number |
M6 |
ø5.2 mm |
700–078838 |
M8 |
ø7.0 mm |
700–078531 |
M10 |
ø8.8 mm |
700–078408 |
M12 |
ø10.7 mm |
700–078409 |
M16 |
ø14.5 mm |
700–078410 |
Manufacturer
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Manufacturer: EMUGE-Werk Richard Glimpel |
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Manufacturer’s address: Nurnberger Strasse 96–100, D-90607 Lauf, Germany |