Airtac PG Reducing Union PG6-4
The AirTAC Airtac PG Reducing Union PG6-4 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 PG6-4
The AirTAC PG6-4 is a different diameter straight union from AirTAC's resin one-touch range. It joins Dia 6 mm soft nylon or polyurethane tube on the large leg to Dia 4 mm tube on the small leg in a straight in-line run, with no change of direction and no thread in the circuit. Push each tube home and the internal chuck grips it; press the release ring to free it again. Because the two chucks work independently, each leg must take tube of exactly its own stamped outer diameter.
This is the resin spec profile, not the lower-rated metal BPC line: working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a working temperature of -20 to +70 C. The chuck and release button are POM and the seal is a stainless spring gasket with an NBR O-ring. Grey is standard; adding the D suffix changes the body to black.
Airtac PG Reducing Union PG6-4 Technical Specifications
| Model | Airtac PG Reducing Union PG6-4 |
|---|---|
| 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 PG6-4
| 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 PG6-4 Is Used
Compact gripper feed on pick-and-place units
Step a Dia 6 header line down to Dia 4 right at a small pneumatic gripper or mini cylinder on a pick-and-place robot, where the narrow bore matches the low air demand of the end effector.
Suction lines on electronics handling heads
The -750 mmHg vacuum rating lets the PG6-4 carry suction circuits on PCB pick heads, dropping from a Dia 6 vacuum manifold to a Dia 4 line feeding a small suction cup.
Air jet drops on packaging conveyor lines
Feed short-burst air jets that clear labels or dust off packs on a packaging conveyor, taking a Dia 6 trunk run down to a Dia 4 nozzle feed with one straight in-line union.
Is the Airtac PG Reducing Union PG6-4 the Right Part?
Dia 4 is the smallest bore the PG reducer union supports - the Dia 3.2 tube size exists only on the mini PC and PL series, so there is nothing smaller to step down to on this shape. Stepping up, Dia 8 is the next tube size, and the documented PG8-4 pairs a Dia 8 inlet with the same Dia 4 outlet when your feed comes off a larger trunk bore. Tube OD must match exactly: the Dia 6 leg will not seal on nominal 1/4 in (about 6.35 mm) tube, and the Dia 4 leg accepts nothing but genuine Dia 4 tubing.
PG is the right answer for a straight run between two bores. If the line has to pass through a control panel wall, use a PM bulkhead union instead; if the drop needs a change of direction at a cramped actuator port, a PL or PV union elbow will save the tube a tight bend.
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 PG6-4 FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, working temperature -20 to +70 C. The fitting is a straight reducer union joining Dia 6 mm tube on one leg to Dia 4 mm tube on the other, both in soft nylon or polyurethane, on a resin one-touch body.
Yes - each leg takes soft nylon or polyurethane tube of exactly the stamped outer diameter. Capacity follows the tube bore rather than the fitting body, so the Dia 4 leg is the limiting side. Keep the Dia 6 section of the run as long as the layout allows and step down only at the small actuator itself.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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