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TAPTITE 2000® proven in light alloy
Working jointly with Magna Powertrain AG, Arnold Umformtechnik, a manufacturer of intelligent fastener solutions,
has carried out a comprehensive study aimed at measuring the requirements of thread-forming screws
combined with aluminium alloys.
The manufacturer of distributor gear units has proved the capability of this screw profile in the form of
Arnold’s TAPTITE 2000® when used in light-metal gear housings.
Arnold says that the results of the study confirm the trend that thread-forming versions will soon be
strong challengers to their metric equivalents. The comprehensive screw-in tests demonstrably
indicate a relatively even pre-tensioning force window for both initial and repeat screw fastenings.
Even at maximum core hole tolerance the method achieves acceptable breakaway
moments.
Under the effects of temperature too the thread-forming screws are able to substantiate
their capability. Despite widely varying temperatures the fall in pre-tensioning force on the
distributor gear unit housing remains at a low level. Furthermore, the triangular profile
of the TAPTITE 2000® reduces tapping torque to a reliable 12 Newton meter.
“According to the study, optimised aluminium alloys - such as GD-AISi9Cu3 - provide
an excellent thread-forming structure, which, together with the triangular shaft
cross-section of the TAPTITE® system, creates low tapping torques and high over
torques. The separation achieved between these two parameters ensures high and
lightly dispersed pre-tensioning forces.”
PEMSERTER® Series 3000™
wins award
The PEMSERTER® Series 3000™ automatic press for installing self-clinching fasteners, manufactured by
PennEngineering®, received an ‘Innovation award for excellence’ at the MIDEST Awards competition.
The award was presented during the annual MIDEST exhibition for industrial subcontractors in November 2008 in
Paris. PennEngineering® says that the PEMSERTER system benefits from full servo actuation technology for clean,
oil-free, and environmentally friendly operation, improved reliability, and minimised maintenance.
“The press can install fasteners permanently in thin-metal sheets up to 30% faster than traditional systems.”
Other innovative features include PC-based programming, menu-driven touch-screen controls, and a patented
LIGHTSTREAM® Operator Safety System. The press offers a 24 inch/61cm throat depth and can deliver ram force up to
16,000lbs/71.2kN.
In addition to PEMSERTER automatic and manual presses, PennEngineering, headquartered in Danboro, PA, USA,
develops and manufactures PEM® self-clinching, broaching, weld and surface mount fasteners; SI® inserts for
plastics; and Atlas® blind threaded inserts.
BMG promotes Nord-Lock
BMG’s specialist fasteners division distributes the Nord-Lock bolt opposite side grip and seat the mating surfaces. The teeth also lock
securing system that uses tension instead of friction to ensure the washers in place, allowing movement only across the face of the
that joints holding sub-assemblies together remain secure. cams. The resulting tension makes the bolt self-locking.
“Bolts on equipment need to be easily removable during These washers can be used on standard grade, as well as high
maintenance procedures, but must resist the loosening effects of grade bolts and there is no need for adhesives to lock the stud bolt.
vibrations and dynamic loads,” says Darryl Campbell, divisional director This system is designed for use in tapped and counter-bored holes and
of BMG’s fasteners division. “Bolts that are locked conventionally by for larger holes or on soft materials, a flange nut or bolt should be
friction in the thread tend to lose most of their preload through used in combination with Nord-Lock washers with a larger outer
vibrations, while those locked by the tension of this system present a diameter.
minor loss of preload which is caused mainly by settlement in the “The advantages of this re-usable system include maximum safety
thread. Even after moderate tightening, the bolt is safely locked when when locking fasteners, easy assembly and disassembly, positive
using Nord-Lock.” locking at low or high preload levels and minimum surface marring or
Nord-Lock washers, which are installed in pairs, cam face to cam scratching. The system, which has the same temperature
face, have cams on one side, with a greater rise than the pitch of the characteristics as a standard bolt or nut, resists loosening caused by
bolt. When the bolt and/or nut is tightened, the radial teeth on the vibration and dynamic loads.”
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