Brochure

9
Screw locking
Thread technology and the polygonal-shaped thread of the HELICOIL
®
Plus
Screwlock lead to a high degree of frictional locking and thus prevents the screw
unscrewing and its losing. Additional locking of the joint with split pins, wires or
washers is not required. Costs are reduced and installation is easier.
Downsizing
Engineers can choose almost any material. The
HELICOIL
®
Plus corresponds to today’s trend toward
lightweight construction (e.g. aluminium and magne-
sium) because this method of thread reinforcement
combines minimum space requirements and high
strength. High-strength screws are therefore also
perfectly suitable for low-shear materials. A reduced
number of joints and smaller screw sizes save
material, installation space and weight – at high
fatigue strength. These are definite advantages of
the HELICOIL
®
system.
Friction
Thread friction and its scatter range can be reduced if a HELICOIL
®
is used. The dispersion range can be restrict-
ed. (For example: If the thread friction value G of a property class 10.9 carbon steel screw, screwed into a
tapped nut thread ranges between 0.12 and 0.18, the G values range between 0.11 and 0.13 if a coil thread
insert is used.) For a torque-controlled screw tightening application, the screw preload-force can be adjusted
more precisely and the yield point of the screw utilised more efficiently. Simultaneously, the preload force is
increased during screw breakage due to reduced torsional stress.
Tight fit
When not installed, the outside diameter of the HELICOIL
®
Plus exceeds the receiving thread by a defined
amount. In combination with the high spring force of the material, this difference in dimension results in radial
expansion and therefore in the tight and clearance-free fit
in the nut thread. Additional locking elements or adhe-
sive – as
are common for fixed bushes — are
therefore obsolete.
If you use impact wrenches,
please contact us.
We will be happy to help you.
with
HELICOIL
®
Plus
without
HELICOIL
®
Plus