Airtac PG Reducing Union PG12-8
The AirTAC Airtac PG Reducing Union PG12-8 is a genuine different diameter straight for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeDifferent diameter straight
- SeriesPG
- 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 PG Reducing Union PG12-8
The PG12-8 is an AirTAC PG different diameter straight union, a tube-to-tube reducer with no thread. It joins a 12 mm outside diameter line on one end to an 8 mm outside diameter line on the other, so a trunk feed can be stepped down to a smaller actuator or valve without adding a threaded adaptor in between. Push the tube home and the internal chuck grips it; press the POM release ring and the tube frees off for rework.
This is a resin and brass one-touch part, not the metal BP line. Its rated window is 0-1.0 MPa (0-10 kgf/cm2) working pressure, 1.5 MPa proof pressure, -20 to +70 C, and it also holds vacuum down to -750 mmHg (10 Torr). Soft nylon or polyurethane tube is the intended media. Body mouldings are PBT with a POM chuck and button, an aluminium-alloy guide, a stainless spring gasket and an NBR O-ring. Standard colour is grey; add the D suffix for black.
Airtac PG Reducing Union PG12-8 Technical Specifications
| Model | Airtac PG Reducing Union PG12-8 |
|---|---|
| Type | Different diameter straight |
| Series | PG |
| 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 PG Reducing Union PG12-8
| PG | Different diameter straight. |
|---|---|
| 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 PG Reducing Union PG12-8 Is Used
Packaging machine air drop
A 12 mm trunk line feeding a cartoning machine can be reduced to 8 mm right at the drop point, putting the smaller-bore feed to the rotary table actuator without an extra threaded body in the run.
Conveyor gripper supply
On palletising conveyors, the 12 mm main runs down the frame while each vacuum or clamp gripper takes an 8 mm branch; PG12-8 makes that step inline with one push-in joint per side.
Vacuum transfer bench
Rated to -750 mmHg (10 Torr), the union suits a lab or electronics bench where a 12 mm vacuum header steps down to 8 mm tubing at the pickup head, and the release ring lets tubing be re-routed during trials.
Is the Airtac PG Reducing Union PG12-8 the Right Part?
Dia 12 is the largest tube outside diameter in this one-touch line, so PG12-8 has nothing bigger above it. The other Dia 12 reducer is PG12-10, which drops the trunk a single size instead of two; choose it when you want a gentler change in flow area across the joint. One size down on the small end, PG10-8, suits circuits built on 10 mm trunking. Flow capacity scales with the 8 mm bore at the throat, so keep the reduced section short if the downstream cylinder is flow hungry.
Tube outside diameter must match the socket exactly: an 8 mm port will not seal on 1/4 inch tube even though the numbers look close, and a 12 mm line will not enter the 8 mm side at all. Because both ends are push-in, no thread selection is needed here - just two clean, square-cut tubes.
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 PG Reducing Union PG12-8 FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, temperature -20 to +70 C, vacuum to -750 mmHg (10 Torr). Size: a different diameter straight union joining Dia 12 tube to Dia 8 tube, tube-to-tube with no thread. Soft nylon or polyurethane tubing only.
No. 1/4 inch tube measures about 6.35 mm outside diameter and the 8 mm chuck cannot seal on it, while 6 mm tube is too small for the socket. Cut a fresh square end on true 8 mm tube for the small side and true 12 mm tube for the large side, then push each home until it stops before relying on the joint.
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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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