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A one-touch fitting used to connect tubing of different sizes.
[Features]
· A compact and lightweight fitting with improved tube insertion/removal.
· Accommodates metric-size and inch sized tubing (outer diameter.) The release button is available with either an ovular or round body shape.
· Requires little force when removing, preventing the chuck from biting too deeply into the tubing.
[See here for catalog]
· Applicable tube outer diameter (metric, Release button: oval (pp. 9) / circle (pp. 106)
· Applicable tube outer diameter (inches), Release button: oval (pp. 33) circle (pp. 138)
[Applications]
· Can be used for connecting tubes of different sizes.
Part Number
Configured Part Number is shown.

Different Diameter Straight KQ2H (Circle Type) Dimensional Drawing

Rectangular type
| Applicable tube outer diameter (mm) | Model | øD1 | øD2 | L | M1 | M2 | Effective area (mm2) | Minimum hole diameter | Weight g | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) | (b) | Nylon | Urethane | ||||||||
| ø2 | ø3.2 | KQ2H02-23A | 5.8 | 7.1 | 26.2 | 11.9 | 13.3 | - | 0.9 | 1.4 | 1.1 |
| ø2 | ø4 | KQ2H02-04A | 5.8 | 8.2 | 26.2 | 11.9 | 13.3 | - | 0.9 | 1.4 | 1.2 |
| ø3.2 | ø4 | KQ2H23-04A | 7.1 | 8.2 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.5 |
| ø3.2 | ø6 | KQ2H23-06A | 7.1 | 10.4 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.8 |
| ø4 | ø6 | KQ2H04-06A | 8.2 | 10.4 | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 2 |
| ø6 | ø8 | KQ2H06-08A | 10.4 | 13.2 | 28.5 | 13.3 | 14.2 | 13.1 | 10.4 | 4.5 | 2.9 |
| ø8 | ø10 | KQ2H08-10A | 13.2 | 15.9 | 30.8 | 14.2 | 15.6 | 26.1 | 18 | 6 | 4.9 |
| ø10 | ø12 | KQ2H10-12A | 15.9 | 18.5 | 33.6 | 15.6 | 17 | 41.5 | 29.5 | 7.5 | 7.2 |
| ø12 | ø16 | KQ2H12-16A | 18.5 | 23.8 | 38.6 | 17 | 20.6 | 58.3 | 46.1 | 9 | 12.4 |
Release button shape: circular
| Applicable tube outer diameter (mm) | Model | øD1 | Release Button Dimensions (a) | øD2 | Release Button Dimensions (b) | L | M1 | M2 | Effective area (mm2) | Minimum hole diameter | Weight g | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) | (b) | øX (X) | Y | øX (X) | Y | Nylon | Urethane | ||||||||
| ø2 | ø3.2 | KQ2H02-23A1 | 5.8 | 5.5 | - | 7.1 | 6.7 | 9.5 | 26.2 | 11.9 | 13.3 | - | 0.9 | 1.4 | 1.1 |
| ø2 | ø4 | KQ2H02-04A1 | 5.8 | 5.5 | - | 8.2 | 7.7 | 10 | 26.2 | 11.9 | 13.3 | - | 0.9 | 1.4 | 1.2 |
| ø3.2 | ø4 | KQ2H23-04A1 | 7.1 | 6.7 | 9.5 | 8.2 | 7.7 | 10 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.5 |
| ø3.2 | ø6 | KQ2H23-06A1 | 7.1 | 6.7 | 9.5 | 10.4 | 9.7 | 12 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.8 |
| ø4 | ø6 | KQ2H04-06A1 | 8.2 | 7.7 | 10 | 10.4 | 9.7 | 12 | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 2 |
| ø6 | ø8 | KQ2H06-08A1 | 10.4 | 9.7 | 12 | 13.2 | 13 | - | 28.5 | 13.3 | 14.2 | 13.1 | 10.4 | 4.5 | 2.9 |
Release button shape: oval
Dimensions/target: ø3.2, ø4, ø6
| Applicable tube outer diameter (inches) | Model | øD1 | øD2 | L | M1 | M2 | Effective area (mm2) | Minimum hole diameter | Weight g | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) | (b) | Nylon | Urethane | ||||||||
| ø1/8 | ø5/32 | KQ2H01-03A | 7.1 | 8.2 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.5 |
| ø1/4 | KQ2H01-07A | 7.1 | 11.1 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 2 | |
| ø5/32 | ø3/16 | KQ2H03-05A | 8.2 | 9.1 | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 1.8 |
| ø1/4 | KQ2H03-07A | 8.2 | 11.1 | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 2.1 | |
| ø3/16 | ø1/4 | KQ2H05-07A | 9.1 | 11.1 | 27.6 | 13.3 | 13.3 | 7.8 | 6.5 | 3.5 | 2.2 |
| ø1/4 | ø5/16 | KQ2H07-09A | 11.1 | 13.2 | 28.5 | 13.3 | 14.2 | 13.5 | 11.5 | 4.6 | 3.2 |
| ø3/8 | KQ2H07-11A | 11.1 | 15.4 | 29.9 | 13.3 | 15.6 | 13.5 | 11.5 | 4.6 | 4.1 | |
| ø5/16 | ø3/8 | KQ2H09-11A | 13.2 | 15.4 | 30.8 | 14.2 | 15.6 | 26.1 | 18 | 6 | 4.7 |
| ø1/2 | KQ2H09-13A | 13.2 | 19.3 | 32.2 | 14.2 | 17 | 26.1 | 18 | 6 | 6.6 | |
| ø3/8 | ø1/2 | KQ2H11-13A | 15.4 | 19.3 | 33.6 | 15.6 | 17 | 35.3 | 29.1 | 7 | 7.3 |
Release button shape: circular
| Applicable tube outer diameter (inches) | Model | øD1 | Release Button Dimensions (a) | øD2 | Release Button Dimensions (b) | L | M1 | M2 | Effective area (mm2) | Minimum hole diameter | Weight g | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) | (b) | X | Y | øX (X) | Y | Nylon | Urethane | ||||||||
| ø1/8 | ø5/32 | KQ2H01-03A1 | 7.1 | 6.7 | 9.5 | 8.2 | 7.7 | 10 | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 1.5 |
| ø1/4 | KQ2H01-07A1 | 7.1 | 6.7 | 9.5 | 11.1 | 10.9 | - | 27.6 | 13.3 | 13.3 | 3.4 | 2.9 | 2.5 | 2 | |
| ø5/32 | ø3/16 | KQ2H03-05A1 | 8.2 | 7.7 | 10 | 9.1 | 8.4 | 11 | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 1.8 |
| ø1/4 | KQ2H03-07A1 | 8.2 | 7.7 | 10 | 11.1 | 10.9 | - | 27.6 | 13.3 | 13.3 | 5.6 | 5.6 | 3 | 2.1 | |
| ø3/16 | ø1/4 | KQ2H05-07A1 | 9.1 | 8.4 | 11 | 11.1 | 10.9 | - | 27.6 | 13.3 | 13.3 | 7.8 | 6.5 | 3.5 | 2.2 |
Release button shape: oval

Main part.
| Body | C3604, PBT, PP, SUS303 |
|---|---|
| Stud | C3604 (thread part), SUS303 (thread part) |
| Chuck | SUS304 |
| Guide | SUS304 |
| Release button | POM |
| Seal, O-ring | NBR |
| Gasket | SUS304, NBR |
Materials.
| Tube materials | FEP, PFA, nylon, soft nylon, polyurethane |
|---|---|
| Tube outer diameter | ø2, ø3.2, ø4, ø6, ø8, ø10, ø12, ø16 |
Applicable tube.
| Usable fluids | Air, water | |
|---|---|---|
| Operating pressure range | -100 kPa to 1 MPa | |
| Guaranteed proof pressure (at 23°C) | 3 MPa | |
| Ambient temperature and fluid temperature | -5 to 60°C, For water: 0 to 40°C (no freezing) | |
| Thread | Mounting section | JIS B0203 (tapered pipe thread) JIS B0205 (metric coarse thread) |
| Nut section | JIS B0205 (metric fine thread) | |
| Thread part seal | Sealing agent included | |
Specifications.
*See the manufacturer's catalog for specifications other than the above
Note 1: Fittings without a thread portion and with all resin bodies are copper free specifications.
Note 2: The surge pressure must be under the maximum operating pressure.
Note 3: Do not use the fittings with a leak tester or for vacuum retention because they are not guaranteed for zero leakage.
Note 4: øD1 and øD2 are the maximum diameters.
| Part Number |
|---|
| Part Number | Minimum order quantity | Volume Discount | Days to Ship | Application | Packing, Material of O-Ring | Applicable Tube O.D.1 (φ) | Applicable Tube Outer Diameter 2 (φ) | Color | Release button shape | Release button color | Custom-made specifications |
|---|
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| Fitting Type | Union with different diameters | Applicable Fluid | Water / Air | Body Material | PBT+PP |
|---|---|---|---|---|---|
| Types | Single-Action Coupling | Union, Unequal Dia. | Reducing Straight | Operating Temperature(°C) | -5::60 |
| Types of connection | Tube Connection | Number of Connection Tubes(piece) | 2 |
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