SMC Networks KQ2 Series, Instruction Manual, Page: 15 / 18

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