The AirTAC Airtac PHK Swivel Reducing Five-way Fitting PHK10-8 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 PHK10-8 is an AirTAC universal reducer triple branch union, a tube-to-tube one-touch fitting with no port thread at all. Its job is to take one Dia 10 mm line and hand it to Dia 8 mm branches in a single body, so a three-way split and a size step happen at the same point instead of through a chain of adaptors. Push each tube home and the internal chuck grips its wall; press the release ring and the tube frees for rework.
This is part of AirTAC's resin and brass one-touch family, not the metal BP line, so the ratings to quote are 0 to 1.0 MPa (0 to 10 kgf/cm2) working, vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa and -20 to +70 C. The release button and chuck are POM, the guide is aluminium alloy, the spring gasket is stainless and the seal is NBR, and the standard body colour is grey. Because it is a reducer, both tube sizes must match exactly: the 10 mm leg will not grip 12 mm tube and the 8 mm legs will not hold 3/8 in (9.5 mm) tubing.
| Model | Airtac PHK Swivel Reducing Five-way Fitting PHK10-8 |
|---|---|
| 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. |
A 10 mm trunk from the FRL on a horizontal cartoner splits through the PHK10-8 into three 8 mm drops feeding the box-clamp and flap-fold cylinders, with the branch angles set to follow the machine frame instead of fighting it.
On a six-axis pick-and-place cell, a 10 mm air line routed along the robot arm base meets three 8 mm PU leads to the gripper valve manifold; the reducer branch union makes the step and split in one fitting, saving two adaptors and two leak points.
A cabinet-door press feeds three pneumatic hold-down clamps from one 10 mm drop; the 8 mm branch legs suit the small clamp cylinders and the universal orientation lets each branch track the crossbeam it is clipped to.
The PHK reducer ladder steps in 2 mm jumps. One step down is the PHK8-6, which suits lighter 8 mm trunks feeding 6 mm drops to compact actuators; one step up is the PHK12-10 for a 12 mm main feeding 10 mm branches, which carries noticeably more air to bigger cylinders. Choose the size by the branch draw, not the trunk alone: an undersized step down starves the far branch on a long run.
Reach for a universal reducer branch union instead of a plain PE tee when the three tube runs do not meet on a flat panel. The branch outlets can be set at the angle each tube run actually needs, so you avoid tight side-bends in 8 mm PU tube, which is the tube itself, not the fitting, that suffers first in tight radii. If the split sits behind a panel wall rather than in free air, a PLM bulkhead male elbow or PM bulkhead union is the better shape.
Quick checklist
It is an AirTAC universal reducer triple branch union joining Dia 10 mm tube to Dia 8 mm tube, with no thread. Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), it holds vacuum to -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the working temperature range is -20 to +70 C. It takes soft nylon or polyurethane tube in its standard grey resin finish.
Yes. AirTAC rates both soft nylon and polyurethane tube for this fitting, so a 10 mm nylon trunk feeding 8 mm PU drops to short-travel actuators is a normal combination. Match each tube OD exactly to its leg - Dia 10 on the large leg, Dia 8 on the branches - and remember PU tube is more flexible but softer, so support long runs so the branches are not side-loaded.
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