Straight line
Mounting
pitch
A
Recommended
No good
45
Counterbore diameter ø
D3
Seal bearing surface diameter ø
D2
Rz 25
(Sealing face)
Chamfer dimension
ø
D1
Female thread inclination
angle: 1 or less
Caution
Fig. 2 When using a tying band to bind the piping together
Fig. 1 Recommended piping
Recommended Piping Conditions
1. When connecting piping to the One-touch fitting, use
pipe length with sufficient margin, in accordance
with the piping conditions shown in Fig. 1.
Also, when using a tying band, etc., to bind the piping together, make sure
that external force does not come to bear on the fitting. (See Fig. 2.)
Unit: [mm]
1. When using a tubing other than from SMC, be careful
of the tolerance of the tubing O.D. and tubing material.
1) Nylon tubing
Within 0.1 mm
2) Soft nylon tubing
Within 0.1 mm
3) Polyurethane tubing 0.15 mm, Within −0.2 mm
2. When using fittings other than those from SMC, be
certain to confirm that operating conditions are such
that no problems will arise.
Do not use the tubing which does not satisfy the specified tubing
O.D. accuracy, or if the tubing has a different I.D., material, hardness,
or surface roughness from those of SMC’s tubing. Please consult
SMC if there is anything unclear. It may cause difficulty in connecting
the tubing, leakage, disconnection of the tubing, or fitting damage.
When used with tubing other than those from SMC, due to their
properties, the products listed below are not subject to
warranty.
KQG2, KQB2, KFG2, KF, ø2M
Tubing
Design / Selection
Tubing size
Mounting pitch
A
Straight line
length
Nylon tubing Soft nylon tubing Polyurethane tubing
ø2
—
—
13 or more
10 or more
ø3.2, 1/8"
44 or more
35 or more
25 or more
16 or more
ø4, 5/32"
56 or more
44 or more
26 or more
20 or more
ø3/16"
67 or more
52 or more
38 or more
24 or more
ø6
84 or more
66 or more
39 or more
30 or more
ø1/4"
89 or more
70 or more
57 or more
32 or more
ø8, 5/16"
112 or more
88 or more
52 or more
40 or more
ø10
140 or more
110 or more
69 or more
50 or more
ø3/8"
134 or more
105 or more
69 or more
48 or more
ø12
168 or more
132 or more
88 or more
60 or more
ø1/2"
178 or more
140 or more
93 or more
64 or more
ø16
224 or more
176 or more
114 or more
80 or more
Fittings & Tubing
Precautions 5
Be sure to read this before handling products.
3. Chamfer dimension for female thread of face seal
fitting (R, NPT, G)
1) Surface roughness of bearing surface: Rz 25 or less
2) Chamfer dimension: ø
D1
, Seal bearing surface diameter: ø
D2
(Refer to the table below.)
3) Female thread inclination angle: 1 or less
4) Counterbore diameter when the female thread is
counterbored.: ø
D3
· Models with width across flats: Body width across flats x 1.1
or more
· Models other than hexagon (Hexagon socket head male
connector etc.): Body dime 0.2 mm or more
The width across flats and the body dimensions differ
depending on the model even when the same thread size
is used. Refer to the dimensions in the catalog.
5) If oil content or sealant is sticking to the female thread, this
may cause damage of the product. Remove it before piping.
Connection
thread size
Chamfer dimension
ø
D1
[mm]
Seal bearing surface diameter
ø
D2
[mm]
R1/8
10.2 to 10.4
12 or more
R1/4
13.6 to 13.8
17 or more
R3/8
17.1 to 17.3
21 or more
R1/2
21.4 to 21.6
27 or more
NPT1/16
8.2 to 8.4
11.11 or more
NPT1/8
10.5 to 10.7
12.7 or more
NPT1/4
14.1 to 14.3
17.46 or more
NPT3/8
17.4 to 17.6
22 or more
NPT1/2
21.7 to 21.9
28.7 or more
G1/8
10.2 to 10.6
12 or more
G1/4
13.6 to 14.0
17 or more
G3/8
17.1 to 17.5
21 or more
G1/2
21.4 to 21.8
27 or more
Caution
Chamfer Dimension for Female Thread
220
Summary of Contents for KQ2 Series
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