The AirTAC Airtac POC Round Thread Straight Connector POC402D-S is a genuine male connector (compact) for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
The POC402D-S is AirTAC's compact POC male connector in the SUS304 stainless variant, joining Dia 4 mm soft nylon or polyurethane tubing to a 1/4in PT male thread. The POC prefix is the shorter-body version of the PC male connector, so it suits cramped cylinder heads and manifold ports where a full-length body will not clear adjacent hardware. On PC and POC straight connectors the stainless option changes the body itself to stainless steel 304, and AirTAC states all parts of the assembly are copper-free; the release button and chuck stay POM, the guide stays aluminium alloy, the spring gasket is stainless and the O-ring is NBR. The D in the code indicates a black release button; on POC it alters only the button colour, not the dimensions or ratings.
Connection is one-touch: push the tube home and the internal chuck grips it for a pressure-tight seal, then press the release ring to free it. The 1/4in PT thread arrives with sealant applied, so hand-tightening plus a modest turn is normally enough. Despite the stainless body, the published ratings are identical to the standard resin line: 0-1.0 MPa (0-10 kgf/cm2) working pressure, -750 mmHg (10 Torr) vacuum, 1.5 MPa proof pressure and -20 to +70 C. The stainless grade buys corrosion resistance and copper-free construction; it does not buy a higher pressure or temperature rating.
| Model | Airtac POC Round Thread Straight Connector POC402D-S |
|---|---|
| Type | Male connector (compact) |
| Series | POC |
| 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.
| POC | Male connector (compact). |
|---|---|
| 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. |
Copper-free air supply to nitrogen purge and chiller lines on semiconductor wafer rinse benches, where even trace copper can contaminate process chemistry and the 4 mm bore matches small-diameter instrument tubing.
Feeding a compact gripper cylinder on a dairy bottle-capping station, where the SUS304 body and the POC's short profile resist caustic wash-down spray and clear the tight space beside the cylinder port.
Plumbing a 1/4in PT threaded regulator outlet down to 4 mm test tubing on a benchtop pneumatic leak-rig, with the one-touch release letting technicians re-route circuits between test sequences.
On the 1/4in thread, Dia 4 is the smallest tube size POC offers - the ladder runs 4, 6, 8, 10, 12 - so the only step up is Dia 6 (POC602), which raises the bore and the airflow capacity through the fitting while keeping the same port. For thread choice at Dia 4, you can drop to 1/8in (POC401) or M5 with its sealing gasket (POC4M5); 1/4in is actually the largest thread in the POC table that still accepts Dia 4, since 3/8in and 1/2in start at Dia 8 and Dia 10 respectively. Pick this SKU when you need the smallest POC bore on a full-size 1/4in port.
One caution: the chuck is machined for exactly 4 mm outside diameter. A Dia 4 fitting will not grip 1/8in (3.2 mm) imperial tube, and no adapter exists inside the fitting. If the hardware you are feeding is a 1/4in port but the line carries more flow than a 4 mm bore allows, step to POC602 rather than forcing this size.
Quick checklist
It is a compact one-touch male connector for Dia 4 mm tubing with a 1/4in PT thread. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), vacuum rating is -750 mmHg (10 Torr), proof pressure is 1.5 MPa and the operating temperature range is -20 to +70 C. Applicable tubing is soft nylon or polyurethane. The body is SUS304 stainless with copper-free construction; these ratings are the same as the standard version - the stainless option does not change them.
No. On POC connectors the D indicates a black release button instead of grey, and nothing else changes - the dimensions, thread and pressure ratings are identical to the standard POC402-S. Keep in mind the stainless dimension tables match the standard part exactly, so it is a direct replacement in the same footprint. What you gain is corrosion resistance and a copper-free flow path, not a size or performance difference.
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