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25
øD
45n
Rz 12.5
øD
45n
Rz 12.5
Connection Female Thread: Rc, NPT, NPTF
Connection Female Thread: G
Caution
Mounting
For G Thread (Face seal type) For Uni Thread
Tightening method
1. First, tighten the threaded portion by hand, then use a proper
wrench, which could be suitable for the width across flats of
the hexagon body, to tighten it further at a wrench tightening
angle shown in the table below. For a tightening torque guide,
refer to the table below.
2. The gasket can be reused up to 6 to 10 times.
Chamfered area for female thread
By chamfering as shown in the table below, machining of threads
is easier and effective for burr prevention.
∗ For Uni thread, Rz 12.5 is necessary for sealing at the
chamfered part.
Tightening method
First, tighten the threaded portion by hand, then use a proper
wrench, which could be suitable for the width across flats of the
hexagon body, to tighten it further at a wrench tightening angle
shown in the table below. For a tightening torque guide, refer to
the table below. Check the dimensions of each product for the
hexagon width across flats.
2. Use G external threads with G internal threads.
Chamfered area for female thread (Recommended value)
1. Confirming to 16030-2001, the chamfered dimensions shown
in the table below are recommended. By chamfering as shown
in the table below, machining of threads is easier and effective
for burr prevention.
Nominal thread
port size
Chamfered dimension øD
Min. Max.
1/8 9.8 10.2
1/4 13.3 13.7
3/8 16.8 17.2
1/2 21.0 21.4
Connection thread
port size
Wrench tightening angle after
tightened by hand (deg)
Proper tightening torque
(N·m)
G1/8 10 to 20 3 to 4
G1/4 15 to 35 4 to 5
G3/8 15 to 35 8 to 9
G1/2 15 to 35 14 to 15
Connection
thread port size
Chamfered dimension øD (Recommended value)
G Rc NPT, NPTF
1/8 10.2 to 10.6 10.2 to 10.4 10.5 to 10.7
1/4 13.6 to 14.0 13.6 to 13.8 14.1 to 14.3
3/8 17.1 to 17.5 17.1 to 17.3 17.4 to 17.6
1/2 21.4 to 21.8 21.4 to 21.6 21.7 to 21.9
Uni thread
port size
Wrench tightening angle after
tightened by hand (deg)
Tightening torque (N·m)
1/8 30 to 45 3 to 4
1/4 15 to 30 4 to 5
3/8 15 to 30 8 to 9
1/2 15 to 30 14 to 15
Uni thread
port size
Wrench tightening angle after
tightened by hand (deg)
Tightening torque (N·m)
1/8 30 to 60 3 to 5
1/4 30 to 60 8 to 12
3/8 15 to 45 14 to 16
1/2 15 to 30 20 to 22
Series AS-FS
Specifi c Product Precautions 3
Be sure to read this before handling. Refer to the back cover for Safety Instructions.
For Flow Control Equipment Precautions, refer to “Handling Precautions for SMC
Products” and the Operation Manual on SMC website, http://www.smcworld.com