Technical Information (2)
1. As illustrated below, the cross
section of FT threads shapes hexagonal in
its
external form and round in its root form. FT screw forms internal
threadsby the
corners of its hexagonal cross section.
2. The ridgelines of hexagonal corners are twisted by 12
degrees against axial line of screw.
This enables to maintain low and stable
driving torque.
3. FT screw can be used for various kinds
of metal as far as it has the property of
ductility and FT screw makes it possible
to reduce the total fastening cost which
is
several times higher than the cost of
screw itself.
 |
 |
| Top page |
Next page |
Features and Functions of FT Screws
FT screw used in no-tapped hole
1. No tapping process required
FT screw is capable to tap the hole by itself.
FT screw forms internal threads of ISO pitch
on
drilled,
pierced or die-casted
holes.
2. No chips produced
No chips are produced, because internal threads
are
made by forming process..
3. Being Compatible with machine screw
Internal threads formed by FT screw are fit
for
machine screw of JIS standard.
FT screw used in pre-tapped hole.
1. Usable for damaged internal threads
FT screw can be used in damaged internal
threads, such as damaged by sputtering of
welding process. FT screw reforms
damaged threads by its forming process.
2. Usable for painted internal threads
FT screw can be used for thick painted or
coated internal threads.
The paint or coating are easily removed by
the hexagonal cross section of FT threads.
This makes it possible to eliminate
the process of masking or re-tapping.
Other Features
1. No spring washer required
With strong thread engagement obtained
by threads forming process, FT screw
has
strong resistance to looseness caused
by
vibration or impact. This feature
enables
to eliminate the use of lock washers
and to
cut down the assembly cost.
2. High performance in electric ground
FT screw keeps close contact
with
internal
threads and this secures
high efficiency
in
electric ground.
