The AirTAC Airtac POC Round Thread Straight Connector POC401-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 POC401-S is an AirTAC POC one-touch male connector, the compact-body version of the straight male fitting, in the SUS304 stainless variant. It joins a Dia 4 mm soft nylon or polyurethane tube to a 1/8in PT male thread. In the -S build for PC and POC connectors, the fitting body itself is Stainless steel 304 and the whole assembly is copper-free; the release button and chuck stay POM with an aluminium-alloy guide, stainless spring gasket and NBR O-ring.
Installation is a genuine one-touch action: push the tube square into the chuck and it grips the OD to seal, and press the release ring to free it for repositioning. The ratings carry over unchanged from the standard resin line - 0 to 1.0 MPa working, -750 mmHg (10 Torr) vacuum, 1.5 MPa proof, -20 to +70 C - because the stainless variant changes materials, never pressure or temperature. The 1/8in thread arrives with sealant already applied.
| Model | Airtac POC Round Thread Straight Connector POC401-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. |
Feeding analytical instruments or lab pneumatics where copper contact could contaminate the process - the SUS304 copper-free body keeps the wetted path clean on a Dia 4 supply line.
The short POC body plugs a small vacuum or air line straight into a gripper or suction-cup port on a pick-and-place head, where a full-size connector would foul the tooling plate.
Supplying 4 mm purge or actuation air to sensors on food-wash or marine equipment, where a plain brass body would stain or corrode but the 304 stainless shell shrugs off splash.
On the 1/8in thread, the POC ladder runs Dia 4, 6, 8 and 10 mm, and Dia 4 is the smallest tube it supports - there is nothing below it, so the only step from here is up to POC601-S, which feeds more flow to the same port through a 6 mm bore. Match the thread to the port first, then pick the bore the actuator actually needs. This is the compact POC body, so it suits short connectors where a full-size PC head would overhang the port.
Tube OD must match exactly: a Dia 4 chuck will not seal on 1/4in (6.35 mm) or any other near-miss size. If you need a through-panel joint instead of a direct port connection, that is the PMF bulkhead family, not this fitting.
Quick checklist
This SKU is a SUS304 stainless POC male connector for Dia 4 mm tube with a 1/8in PT thread. Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), negative pressure -750 mmHg (10 Torr), proof pressure 1.5 MPa, and working temperature -20 to +70 C. It accepts soft nylon or polyurethane tubing, and the stainless build does not change any of these figures.
No. The chuck in this fitting is cut for a 4 mm OD only, so a near-miss tube will not seal and can blow off under pressure. Use 4 mm nylon or polyurethane, or move to the POC601-S with a 6 mm chuck if the line needs the larger bore.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard parts are processed and dispatched in 3-5 business days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.