SMC Networks ASP Series Operation Manual page 9

Mounting
Caution
③This product has a stopper for fully close in
rotating direction Excess torque may break
the stopper. Table
maximum allowable torque of the knob.
Body size Maximum allowable torque [N·m]
M5
1/8
1/4
3/8
1/2
(1) For R, NPT, G thread
①Tightening method
To tighten a screw on the vertical type, first
tighten it by hand and then hold the width across
flats of the body B and turn it by using an
appropriate wrench. To tighten a screw on the
horizontal type, tighten it by hand and then insert
an appropriate
hexagonal socket of the stud and turn it.
Refer to the reference values in the table below
for the tightening torque.
Connection thread
size
1/8
1/4
3/8
1/2
②Chamfered area for female thread
By chamfering as shown in the following table,
machining of threads is easier and effective for
burr prevention.
Chamfered port size φD （Recommended value）
Connection
Thread size
Rc
1/8 10.2 to 10.4
1/4 13.6 to 13.8
3/8 17.1~17.3
1/2 21.4~21.6
*G thread (face seal) complies with ISO16030-
2001.
below shows
0.05
0.07
0.16
0.2
0.4
hexagon wrench to
Tightening Torque
(N・m)
3 to 5
8 to 12
15 to 20
20 to 25
NPT G Face seal
10.5 to 10.7 9.8 to 10.2
14.1 to 14.3 13.3 to 13.7
17.4~17.6 16.8~17.2
21.7~21.9 21.0~21.4
Piping Threads with Sealant
Caution
(1) If the fitting is tightened with excessive
torque, a large amount of sealant will seep
the
out. Remove the excess sealant.
(2) Insufficient tightening may loosen the
threads, or cause air leakage.
(3) Reuse
①Normally, fittings with a sealant can be reused
2 to 3 times.
②To prevent air leakage through the sealant,
remove any loose sealant stuck to the fitting
by blowing air over the threaded portion.
③ If the sealant no longer provides effective
sealing, wrap sealing tape over the sealant
before reusing. Do not use the sealant in any
form other than a tape type.
(4) Once the fitting has been tightened, backing
the
it out to its original position often causes the
sealant to become defective. Air leakage will
occur
(5) Use R external threads with Rc internal
threads and NPT external threads with NPT
internal threads.
Caution
(1) Refer to the Fittings & Tubing Precautions for
handing One-touch fittings.
(2) 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.
(3) Winding of sealant tape
When screwing together pipes and fittings, etc.,
be certain that chips from the pipe threads and
sealing material do not get inside the pipe.
Also, when the sealant tape is used, leave
approx. 1 thread ridges exposed at the end of
the threads.
-8-
Piping