Airtac PU Straight Fitting PU6
The AirTAC Airtac PU Straight Fitting PU6 is a genuine straight union for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeStraight union
- SeriesPU
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure1.5 MPa
- Temperature-20 to +70 °C
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac PU Straight Fitting PU6
The PU6 is an AirTAC PU straight union, a tube-to-tube fitting with no external thread at all. It joins two runs of 6 mm outer diameter soft nylon or polyurethane tubing end to end in a straight line. Both sockets are identical Dia 6, so it is the fitting to reach for when a tube run is too short, has been damaged, or needs a clean extension between two points.
Connection is the standard one-touch action: push the tube fully home and the stainless spring gasket plus POM chuck grip it against the NBR O-ring seal; press the release ring and the tube frees off again. The PU6 belongs to AirTAC's resin and brass one-touch profile, rated 0-1.0 MPa (0-10 kgf/cm2) working pressure, -750 mmHg vacuum, 1.5 MPa proof pressure and -20 to +70 C. The grey body carries a POM release button and chuck with an aluminium-alloy guide; add the D suffix code (PU6D) for the black colour option.
Airtac PU Straight Fitting PU6 Technical Specifications
| Model | Airtac PU Straight Fitting PU6 |
|---|---|
| Type | Straight union |
| Series | PU |
| Connection | Push-in one-touch |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Applicable tubing | Soft nylon or polyurethane tube |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
POM release button and chuck, aluminium-alloy guide, stainless spring gasket, NBR O-ring; body brass or PBT depending on the part. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PU Straight Fitting PU6
| PU | Straight union. |
|---|---|
| 4 / 6 / 8 / 10 / 12 | Tube outside diameter in mm (3.2 mm exists on the mini series). |
| M5 / 01 / 02 / 03 / 04 | Thread: M5x0.8, 1/8", 1/4", 3/8", 1/2" (M3 on the mini series). |
| D | Black. Blank = grey. |
Fitting & Sealing Notes
- check Cut the tube square and clean before pushing it home, or the seal will leak.
- check Push until it stops, then pull back to check the chuck has gripped.
- check To release, press the collet ring fully in and pull the tube out.
- check Threaded parts arrive with sealant on the thread; M5 sizes use a sealing gasket.
- check Match the tube OD exactly - a 6 mm fitting will not hold 1/4" tube.
Where the Airtac PU Straight Fitting PU6 Is Used
Splicing damaged tubing on packaging machines
When a 6 mm nylon drop to a conveyor stopper cylinder is cut or crushed, a PU6 unions the replaced section into the existing run without re-piping back to the valve manifold.
Vacuum circuits on pick-and-place heads
Rated to -750 mmHg (10 Torr), the PU6 extends 6 mm vacuum tube between an ejector and suction cup holder on electronics pick-and-place gantries without adding a threaded junction to leak-check.
Extending lines off solenoid valve manifolds
On a printing press or textile machine where the valve bank sits far from the actuator, a PU6 lets standard 6 mm tube stock be lengthened cleanly instead of ordering one long custom cut.
Is the Airtac PU Straight Fitting PU6 the Right Part?
Both neighbours step in tube bore, not thread, because this fitting has none. Step down to PU4 for 4 mm signal and pilot lines, where the narrower bore suits low-volume circuits; step up to PU8 when the same splice is feeding a cylinder or actuator that draws more air. If you actually need to join two DIFFERENT diameters, that is not this part - the PG different diameter straight union covers 6-to-4 style transitions, so order PG6-4 rather than forcing a mismatch.
Check the tube itself before ordering: a one-touch socket holds only the exact OD it is machined for, and a 6 mm chuck will not seal or grip 1/4 inch (6.35 mm) tube even though the two look close. Measure the tube, do not eyeball it.
Quick checklist
- ✓ Tube outside diameter matches exactly
- ✓ Thread size and standard match the port
- ✓ Working pressure within 0 - 1.0 MPa (0 - 10 kgf/cm2)
- ✓ Temperature within -20 to +70 °C
Airtac PU Straight Fitting PU6 FAQ
The PU6 is a resin one-touch straight union joining two Dia 6 mm tubes with no thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), vacuum capability is -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. It suits soft nylon or polyurethane tubing, with a grey POM and aluminium-alloy body as standard.
No. Both sockets on the PU6 are Dia 6 only - a different-diameter joint needs the PG series (for example PG6-4), and a threaded connection needs a male connector such as the PC series. Also remember the 6 mm socket will not grip 1/4 inch tube; the OD must match exactly for the chuck and O-ring to seal.
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Covers non-human-caused product damage.
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Standard parts are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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