Mandrel
Winding
direction
Sealant tape
Exp
ose
app
rox.
1
thre
ad r
idge
.
1. Keep the connection part of fittings and tubing from
rotating or oscillating movement. Use Rotary
One-touch Fittings (KS or KX series) in these cases.
The fittings may be damaged if they are used in the above
manner.
2. The tubing bending radius in the vicinity of the fitting should
be at least the minimum bending radius of the tubing.
If the bending radius is less than the minimum value, fittings may
damage, or tubing may crack or be crushed. The minimum
bending radius of the FR soft nylon tubing (TRS series), FR double
layer tubing (TRB series), antistatic soft nylon tubing (TAS series),
polyolefin tubing (TPH series), and soft polyolefin tubing (TPS
series) is measured as following in accordance with JIS B 8381.
Tubing deformation ratio at the minimum bending radius is
obtained through the following formula, based on tubing diameter
and mandrel diameter by winding the same radius mandrel tube.
3. Do not use fluids other than listed on the specifications.
Applicable fluids are air and water. Please consult with SMC if
using other fluids.
4. When it is used with water, the fittings or tubing may
be damaged depending on the surge pressure.
5. Depending on the storage or operating environment
and the period of storage or use, the surface of the
brass (C3604) may blacken. If the discoloration of
the brass is a problem, we recommend selecting
electroless nickel-plated brass instead.
Example) KQ2H06-01 NS
1. Preparation before piping
Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and
other debris from inside the pipe.
2. Winding of sealant tape
When screwing together pipes and
fittings, etc., be certain that chips
from the pipe threads and sealant
do not get inside the pipe.
Also, when the sealant tape is
used, leave approx. 1 thread ridge
exposed at the end of the threads.
3. Check the model, type and size before installation.
Also, confirm that there is no scratches, gouges or
cracks on the product.
4. When connecting the tubing, take pressure or
possible changes to the tubing length into account,
and allow a sufficient margin.
Failure to do so may result in fitting breakage or detachment of
the tubing. Refer to the recommended piping conditions.
5. Do not apply unnecessary forces such as twisting,
pulling, moment loads, vibration and impact, etc. on
fittings or tubing.
This will cause damage to fittings and will crush, burst or
release tubing.
6. Tubing, with the exception of coiled tubing, requires
stationary installation. Do not use standard tubing (non-
coiled) in applications where tubing is required to travel
inside the flexible protection tube. Tubing that travels
may sustain abrasion, extension, or severance due to
tensile force, or may result in removal of tubing from
fitting. Use caution prior to use for proper application.
7. To install the fitting, screw the fitting into the
hexagonal face of the body, and tighten with an
appropriate wrench.
Affix the wrench at the base of the thread. If the size of
hexagonal face and wrench do not match, or tightening takes
place near the tube side, it may cause collapse or deformation
of the hexagonal face, or damage to the equipment. After
installing, confirm that there is no damage to the fitting, etc.
Fittings & Tubing
Precautions 1
Be sure to read this before handling products.
Here,
: Deformation ratio [%]
d : Tubing diameter [mm]
L : Measured length [mm]
D : Mandrel diameter [mm]
(Twice against the minimum
bending radius)
Test temperature: 20 5 C
Relative humidity: 65 5%
Tube deformation ratio at the
minimum bending radius
Design / Selection
Mounting / Piping
Warning
Warning
1. Confirm the specifications.
Products represented in this catalog are designed only for use
in compressed air systems (including vacuum). Do not operate
at pressures, temperatures, etc., beyond the range of
specifications, as this can cause damage or malfunction.
(Refer to the specifications.)
Please contact SMC when using a fluid other than compressed
air (including vacuum).
We do not guarantee against any damage if the product is
used outside of the specification range.
2. Do not disassemble the product or make any
modifications, including additional machining.
It may cause human injury and/or an accident.
3. Check if PTFE can be used in application.
PTFE powder (Polytetrafluoroethylene resin) is included in the
sealant. Confirm that the use of it will not cause any adverse
affect on the system.
Caution
1. Operation manual
Install the products and operate them only after reading the
operation manual carefully and understanding its contents. Also,
keep the manual where it can be referred to as necessary.
2. Maintenance space
Allow sufficient space for maintenance and inspection.
3. Adhere to the thread tightening method.
Refer to “Connection Thread Tightening Method” when
mounting the product.
4. There may be cases of the tubing detaching from the
fitting and thrashing around uncontrollably due to
tubing degradation or fitting breakage.
To prevent the situation from becoming uncontrollable, fit the
tubing with a protective cover or fix it in place.
Caution
=
L − D
2d
1 −
x 100
216
Summary of Contents for KQ2 Series
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