Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S
SUS304 stainless variant (-S)The AirTAC Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S is a genuine male reducer triple branch for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeMale reducer triple branch
- SeriesPKD
- 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 PKD Reducing Thread 5-Way Fitting PKD6-401D-S
The PKD6-401D-S is an AirTAC male reducer triple branch: a one-touch fitting that turns a single 1/8in PT male port into a Dia 6 through-run with two Dia 4 branch outlets at 90 degrees. The run side grips 6mm tubing while both branches take 4mm tube, so a manifold drop can feed smaller actuators or sensors without adding separate reducers. Push the tube home and the internal chuck grips it; press the release ring and it slides free. Body and thread seal are standard for the resin line: POM chuck and button, aluminium-alloy guide, stainless spring gasket, NBR O-ring, and a PBT threaded body on a brass stud.
This is the D (black) colour with the -S upgrade: the stud is SUS304 stainless steel, while the body stays PBT. That is how AirTAC builds stainless across the PKD family, so treat the stainless as targeted corrosion protection at the metal-to-machine interface rather than a full stainless body. Ratings are unchanged from the standard resin profile: 0-1.0 MPa working pressure, -750 mmHg vacuum, 1.5 MPa proof pressure, -20 to +70 C. Threads arrive with sealant pre-applied, and the thread standard throughout this catalogue is PT.
Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S Technical Specifications
| Model | Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S |
|---|---|
| Type | Male reducer triple branch |
| Series | PKD |
| Connection | Push-in one-touch |
| Body material | Stainless steel 304 (-S variant) |
| 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. Stainless (-S): SUS304 in place of brass - a solid SUS304 body on the PC and POC straight connectors, and a PBT body with a SUS304 stud on the elbow, tee and branch shapes. Working pressure, proof pressure and temperature are unchanged from the standard version. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S
| PKD | Male reducer triple branch. |
|---|---|
| 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. |
| -S | Stainless-steel body. |
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 PKD Reducing Thread 5-Way Fitting PKD6-401D-S Is Used
Mini gripper feed on an assembly cell
A Dia 6 drop from the valve manifold carries the main supply, while the two Dia 4 branches run down to the open/close ports of a small parallel gripper - one fitting replaces a tee plus two reducers.
Analyser sampling manifold
On a laboratory instrument panel the 1/8in PT stud screws into a tapped port, the Dia 6 run continues the carrier-gas line, and Dia 4 branches feed a sensor and a purge outlet from the same point.
Packaging machine blow-off branch
Mounted at the end of a Dia 6 air run along a carton conveyor, the reducer tee splits into two Dia 4 lines feeding narrow-slot blow-off nozzles that keep labels flat before the print head.
Is the Airtac PKD Reducing Thread 5-Way Fitting PKD6-401D-S the Right Part?
AirTAC makes exactly three PKD part numbers, so your options are narrow by design. There is no smaller PKD below the Dia 6 / Dia 4 combination. The only step up is PKD8-602, which moves the run to Dia 8 tube, the branches to Dia 6, and the thread to 1/4in PT - a real capacity jump, so choose it when the through-flow path feeds more than one or two small loads. If you need branches off a smaller port, the PED male run tee in Dia 4 is the neighbouring shape instead, though it keeps one tube diameter throughout rather than stepping down.
Match the 1/8in PT male thread to the port it enters and check the stud orientation you need before ordering. Remember that tube OD must match the socket exactly: a Dia 4 branch will not seal on 1/8in imperial tubing and a Dia 6 run will not grip 1/4in tube, whatever the thread size.
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 PKD Reducing Thread 5-Way Fitting PKD6-401D-S FAQ
It is a male reducer triple branch with a Dia 6mm through-run, two Dia 4mm branch outlets and a 1/8in PT male thread, in black with a SUS304 stainless stud and PBT body. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), vacuum is -750 mmHg (10 Torr), proof pressure is 1.5 MPa, and the temperature range is -20 to +70 C. Soft nylon or polyurethane tubing only, and the thread standard is PT.
No. AirTAC makes exactly three: PKD6-401 (Dia 6 run, Dia 4 branches, 1/8in thread), PKD8-602 (Dia 8 run, Dia 6 branches, 1/4in thread) and PKD10-803 (Dia 10 run, Dia 8 branches, 3/8in thread). This SKU is the smallest of the three, so if your run tube is smaller than 6mm you need a different family such as the PED run tee rather than a PKD.
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