The AirTAC Airtac PHK Swivel Reducing Five-way Fitting PHK10-8D is a genuine universal reducer triple branch union for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
The PHK10-8D is an AirTAC universal reducer triple branch union, a tube-to-tube fitting that takes one Dia 10 mm trunk line and splits it into three reduced Dia 8 mm branch legs. Being a union, it has no threaded port at all: air flows from the large inlet leg into the three smaller outlets through one moulded body, so you build the reduction and the distribution into a single push-in point instead of stacking a tee plus two reducers.
It belongs to the resin and brass one-touch family, not the metal line: working pressure 0-1.0 MPa, negative pressure down to -750 mmHg, proof pressure 1.5 MPa, and a temperature range of -20 to +70 C with soft nylon or polyurethane tubing. Push the tube home and the POM chuck grips it; press the release ring and it slides free. The trailing D in the code means the body is black rather than the standard grey, which matters on machines where grey fittings disappear against the frame.
| Model | Airtac PHK Swivel Reducing Five-way Fitting PHK10-8D |
|---|---|
| Type | Universal reducer triple branch union |
| Series | PHK |
| 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.
| PHK | Universal reducer triple branch 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. |
On a carton overwrapping line, a Dia 10 trunk runs the length of the conveyor and this union taps three Dia 8 legs to feed suction cups that hold the blank carton square while flaps are folded.
A Dia 10 main line from the mould dryer splits here into three Dia 8 nozzles that blast cooling air on ejected plastic housings, all from one compact push-in point inside the tooling plate.
On a woodworking CNC router, the vacuum generator output at Dia 10 feeds three Dia 8 legs to alternate clamping zones on the spoilboard, letting the operator isolate pods without replumbing.
Step down to PHK8-6 when your trunk is Dia 8 and the branches feed small actuators or sensors on Dia 6 tube; step up to PHK12-10 for a Dia 12 main feeding three Dia 8 legs. The rule that decides it: tube OD must match the port exactly, so a Dia 8 leg will not seal in the Dia 10 inlet of this part and the Dia 10 trunk will not enter a Dia 8 leg. Check both ends of every leg before ordering.
If your branches need a male thread instead of plain tube tails, the threaded equivalent is the PKD male reducer triple branch, and AirTAC makes only three of those: PKD6-401, PKD8-602 and PKD10-803. There is no threaded PKD at 10-to-8, which is precisely why this all-tube union exists at this size.
Quick checklist
It is a black (D suffix) universal reducer triple branch union joining one Dia 10 mm inlet leg to three Dia 8 mm branch legs, all push-in. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 1.5 MPa and temperature -20 to +70 C. Use soft nylon or polyurethane tubing only; there is no threaded port on this part.
Yes, mixing is the whole point of a reducer union, but only in the pattern this part was made for: Dia 10 into the single large leg and Dia 8 into each of the three branch legs. Every leg is dimensioned for one exact OD, so a Dia 8 tube will not grip in the Dia 10 leg and a Dia 10 tube will not enter the Dia 8 legs. Cut the tube square and push it fully home to the stop for a reliable seal.
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