Brochure

8
Corrosion and temperature resistance
The standard material of the HELICOIL
®
Plus prevents seizing of screws under environmental influences.
HELICOIL
®
Plus thread inserts of nickel-based materials are available for thermally highly stressed screw joints.
Elasticity and spring force remain constant. For materials particularly susceptible to corrosion, such as
magnesium, the HELICOIL
®
Plus made of hard-coated high-strength aluminium is used.
This prevents contact corrosion caused by galvanic action.
HELICOIL
®
thread inserts – a close look at the advantages
Strength
The elastic properties of the HELICOIL
®
Plus thread
insert allow a uniform load and stress distribution. An
optimum flank contact is achieved. Variable pitches
and angles are compensated for over the entire length
of the thread insert. Force transmission from bolt to nut
thread is optimised. The quality of the screw joint is
considerably increased – for static as well as dynamic
operating loads.
Due to the improved distribution of the preload-force,
the fatigue strength of dynamically loaded screws is
increased. This is why the HELICOIL
®
is also suitable
for use in threads in high-strength materials, e.g. steel
or cast iron alloys.
Wear resistance
HELICOIL
®
Plus thread inserts are made of austenitic
chrome-nickel steel (minimum tensile strength
1,400 N/mm²). The high surface quality of the rolled
thread ensures a high-strength, wear-resistant thread
with an extremely small and constant thread friction
torque. Therefore, a higher, constant preload-force is
achieved for repeated cycles at the same tightening
torque. The utilisation of the yield point of high-strength
screws is improved. Torsion stress is considerably
reduced. Compared to tapped threads, the surface
roughness of the HELICOIL
®
Plus is reduced by 90 %.