Airtac PG Reducing Union PG8-6D
The AirTAC Airtac PG Reducing Union PG8-6D 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 PG8-6D
The PG8-6D is an AirTAC PG series different diameter straight union, an inline push-to-connect reducer that joins Dia 8 mm soft nylon or polyurethane tubing on one end to Dia 6 mm on the other. There is no threaded port anywhere on the part: the whole pressure boundary is made by two collet chucks sharing one tapered bore, so the flow path steps down inside the fitting rather than at a port.
Insert the tube straight into each end until it bottoms; the stainless spring gasket and chuck jaws grip the OD and seal on the NBR O-ring, and the POM release ring frees it again when depressed. This is the resin one-touch spec profile, not the metal BP line: 0-1.0 MPa working pressure, 1.5 MPa proof pressure, -20 to +70 C, and -750 mmHg vacuum capability. The D suffix makes the entire body black on this series, unlike on the PC connector where black touches only the release button.
Airtac PG Reducing Union PG8-6D Technical Specifications
| Model | Airtac PG Reducing Union PG8-6D |
|---|---|
| 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 PG8-6D
| 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 PG8-6D Is Used
Cartoner vacuum cup feed
On a carton-forming machine the vacuum generator trunk is plumbed in 8 mm tube, while each suction cup drop is 6 mm; this union makes the step in a straight run without adapters.
Pick-and-place gripper circuit
A delta robot cell runs a 6 mm line to the compact gripper off an 8 mm valve-manifold drop, and the reducing union keeps the junction inline and tool-free.
Conveyor air-knife take-off
Bottle-rinse conveyors feed short air-purge jets from a main 8 mm header; stepping to 6 mm at each jet point trims air use without changing the header.
Is the Airtac PG Reducing Union PG8-6D the Right Part?
Step down and up: this SKU takes an 8 mm supply and drops it to a 6 mm take-off. PG8-4 is the neighbour below, a sharper 8-to-4 reduction for feeding very small actuators from a mid-size trunk; above it, PG10-8 keeps the same one-step drop on a 10 mm line, and PG10-6 jumps two sizes when a 6 mm branch runs off a 10 mm manifold. Whichever you choose, remember the rule the hard way: a Dia 6 chuck will not hold 1/4 in (6.35 in nominal) tube, and no PG end is convertible.
If your real need is a panel pass-through rather than a size step, look at the PM bulkhead union instead, and if the branch needs three tubes rather than two, the PKG reducer triple branch is the matching shape.
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 PG8-6D FAQ
It is a resin one-touch different diameter straight union for Dia 8 mm tube on one end and Dia 6 mm on the other, with no threaded port. 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 only.
No. The 8 mm end will not seal or grip a 6 mm tube, so always match each tube OD exactly to its end. AirTAC publishes no flow curve figures for PG parts, but qualitatively the smaller 6 mm bore sets the capacity of the whole run, so if your circuit is flow-hungry, stepping to 6 mm here is the wrong place to save space.
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