The AirTAC Airtac PHK Swivel Reducing Five-way Fitting PHK8-6D 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 PHK8-6D is AirTAC's universal reducer triple branch union from the resin one-touch family: a three-way tube-to-tube tee whose Dia 8 run steps down to a Dia 6 branch. It is moulded in black because of the D colour suffix - on non-PC series the D changes the body itself, not just the release button, which helps colour-code sub-circuits on a crowded machine. Push each soft nylon or polyurethane tube home and the internal chuck grips it; press the POM release ring to free it.
This union runs on the standard resin spec profile, not the metal line: working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature range of -20 to +70 C. The construction is a POM button and chuck, PBT body, aluminium-alloy guide, stainless spring gasket and an NBR O-ring. As a single moulded part it replaces a Dia 8 tee plus a Dia 8-to-6 adapter, removing two joints and two potential leak points from the circuit.
| Model | Airtac PHK Swivel Reducing Five-way Fitting PHK8-6D |
|---|---|
| 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 an electronics assembly head, the Dia 8 run carries the main air feed while the reduced Dia 6 branch drops to a compact gripper cylinder - one moulded tee instead of a threaded tee plus a reducing adapter.
In a laboratory autosampler, the Dia 6 leg feeds small primer and pinch actuators while the Dia 8 side ties into the instrument's main nylon circuit, keeping the sub-assembly tool-free to service.
Along a packaging line, the Dia 8 main run feeds a Dia 6 branch that blows cartons open at the former or clears dust from a belt scraper station, with the black body visible against steel framework.
Neighbouring reducers in the PHK ladder are PHK6-4 one step down and PHK10-8 one step up. The 6-4 suits instrument-grade drops and light duty legs, while the 10-8 moves to a larger bore where the branch feeds a bigger actuator. Capacity scales with bore - AirTAC publishes flow only as a characteristic curve, so size by tube diameter and duty rather than a catalogue number. Tube OD must match exactly: the Dia 6 port will not hold 1/4 in tube, and the two are not interchangeable. Because this union carries no thread, plan the port side separately with a matching male connector such as a PC802 on the Dia 8 leg.
Quick checklist
It is a black universal reducer triple branch union joining Dia 8 tube to a Dia 6 branch, with no thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, vacuum rating -750 mmHg (10 Torr) and temperature range -20 to +70 C. Tubing is soft nylon or polyurethane, and the wetted parts are a POM release button and chuck, PBT body, stainless spring gasket and NBR O-ring.
No. One-touch ports grip only the exact outside diameter they are bored for, so the Dia 6 leg takes 6 mm tube only and the Dia 8 legs take 8 mm only. 1/4 in tube measures about 6.35 mm, so it will neither seal nor release correctly. If your circuit is dimensioned in inches, use the separate imperial N-series fittings instead.
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