Airtac PU Straight Fitting PU12
The AirTAC Airtac PU Straight Fitting PU12 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 PU12
The PU12 is an AirTAC one-touch straight union, a tube-to-tube fitting with no external thread at all. Both ends accept Dia 12 mm soft nylon or polyurethane tubing, so it is used to join two equal-sized lines in a straight run - extending a feed, splicing a replacement section, or closing a gap without cutting and re-threading anything. Push the tube home and the internal chuck grips it under line pressure; press the POM release ring and the tube slides back out.
This is the resin/brass spec profile: working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, and a temperature band of -20 to +70 C. The standard body is grey; a D suffix changes it to black. Inside, a stainless spring gasket and NBR O-ring do the sealing, and the mating surfaces arrive pre-treated so no additional thread sealant is needed anywhere - there is no thread to seal.
Airtac PU Straight Fitting PU12 Technical Specifications
| Model | Airtac PU Straight Fitting PU12 |
|---|---|
| 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 PU12
| 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 PU12 Is Used
Splicing a damaged air drop
On a pallet-wrapper or case-erector line, a snagged Dia 12 drop line can be cut clean and rejoined with a PU12 in seconds - no port re-threading, no sealant, and the release ring lets you pull it apart again for the next repair.
Long feed run on a chip conveyor
CNC chip conveyors often need a 12 mm feed line stretched beyond a single tube length. A PU12 butt-joins two sections in line, keeping the full Dia 12 bore so the scraper-cylinder stroke time is not throttled by a reduced fitting.
Extending a clamp circuit on a press fixture
Weld and press fixtures frequently add swing clamps after build. A PU12 lets the Dia 12 supply branch be extended straight to the new clamp position without disturbing the manifold or fitting an extra threaded tee.
Is the Airtac PU Straight Fitting PU12 the Right Part?
Step down to PU10 if your line is Dia 10 mm - the union body gets slightly smaller and the bore carries less capacity, so longer runs to a big cylinder may lose some response. There is no step up: Dia 12 is the largest tube size AirTAC publishes in this catalogue (there is no Dia 16), so PU12 sits at the top of the union ladder. If you actually need 1/2-inch tubing, this series is not it - the sizes are metric outside diameters only.
Check the two tube ends are genuinely the same OD before ordering. A Dia 12 chuck will not hold 1/2-inch hose and will not seal on Dia 10 tube. Where the run has to turn instead of passing straight through, the PV union elbow is the same principle bent through 90 degrees; where you need a third leg, look at the PE tee instead. For a threaded connection into a valve or cylinder port, you want the PC male connector family, not a union.
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 PU12 FAQ
The PU12 is a one-touch straight union joining two Dia 12 mm tubes with no thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure reaches -750 mmHg (10 Torr), and proof pressure is 1.5 MPa. It operates from -20 to +70 C on soft nylon or polyurethane tubing. The body is grey as standard, with POM release buttons, stainless spring gaskets and NBR O-rings.
No. The chuck in each end is machined for exactly Dia 12 mm outside diameter tubing - soft nylon or polyurethane. A 1/2-inch hose is roughly 12.7 mm and will not seal or grip, and Dia 10 tube will simply pull out. If your tube is Dia 10, order the PU10; if you need to join two different diameters, the PG different-diameter straight union is the part designed for that.
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