SMC Networks ASD F-A Series Operation Manual page 7

Caution
(1)-2 For R, NPT, G thread
①Tightening method
When installing the connection thread, tighten it
to the appropriate tightening torque as shown in
the table below. As a rough guide, 2 turn to 3
turn revolutions with a tool after hand-tightening
is equivalent. Please refer to the dimension
table of each product for tooling.
Connection thread
size（R,NPT,G）
1/8
1/4
3/8
1/2
②Chamfered area of female thread
By chamfering as shown in the table below,
machining of threads is easier and effective for
burr prevention.
Connection Chamfer
thread value)
size Rc
1/8
10.2～10.4
1/4
13.6～13.8
3/8
17.1～17.3
1/2
21.4～21.6
※ 1 G thread (face seal) complies with
ISO16030-2001.
※ 2 Use G external threads with G internal
threads.
Piping Threads with Sealant
Caution
(1) If the fitting is tightened with excessive
torque, a large amount of sealant will
seep out. Remove the excess sealant.
(2) Insufficient tightening may loosen the
threads, or cause air leakage.
Mounting
Proper tightening torque
【N・m】
3～5
8～12
15～20
20～25
dimensionφD(Recommended
NPT、NPTF
10.5～10.7 9.8～10.2
14.1～14.3 13.3～13.7
17.4～17.6 16.8～17.2
21.7～21.9 21.0～21.4
(3) Reuse
① Normally, fittings with a sealant can be
reused 2 to 3 times.
② To 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 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
G
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.
6
Piping Threads with Sealant
Caution
Piping