The AirTAC Airtac POC Round Thread Straight Connector POC401D-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 POC401D-S is AirTAC's compact one-touch male connector in the SUS304 stainless variant, joining Dia 4 mm soft nylon or polyurethane tube to a 1/8 in PT male thread. Push the tube home and the internal chuck grips it under the stainless spring gasket; press the release ring to free it. On the POC series the body is noticeably shorter than the standard PC male connector, which is the reason to pick it when a sensor port or valve manifold sits close to a wall or another fitting.
The -S suffix changes the straight-connector body itself to stainless steel 304, and the construction is copper-free throughout, so it suits corrosion-prone circuits and processes where copper contamination matters. The release button and chuck stay POM (in black here, since on POC the D suffix changes only the button colour, not the body), with an aluminium-alloy guide, NBR O-ring and stainless spring gasket. Ratings are identical to the grey resin version: 0-1.0 MPa working pressure, 1.5 MPa proof, -750 mmHg vacuum and -20 to +70 C. The 1/8 in thread arrives with sealant already applied.
| Model | Airtac POC Round Thread Straight Connector POC401D-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. |
A 4 mm signal or purge line to a conductivity probe above a copper-plating bath, where a copper-free SUS304 body resists splash and mist that would pit brass.
Feeding a compact reject-confirmation cylinder on a bakery packaging machine, where the short POC body clears the guard and the stainless body survives daily caustic rinse-down.
A Dia 4 vacuum sensing line from an ejector on an electronics pick-and-place head, using the -750 mmHg rating and the small bore for a fast-responding signal hose.
Dia 4 is the smallest tube size the POC offers on a 1/8 in thread, so the only step up within this thread is the POC601D-S at Dia 6 mm, which buys a stiffer line and more bore for short runs to small actuators. Thread-wise you can step down to M5 (POC40M5-S, sealed by a gasket rather than sealant) for compact valve ports, or up to 1/4 in on the POC402. Match the thread to the port first, then the tube: a Dia 4 chuck will not grip 4 mm fractional or 6 mm tubing.
If the line needs to turn, this straight body is the wrong shape - a PL or PLL male elbow saves the bend radius on Dia 4 tube, and a PMF bulkhead connector is the answer where the tube has to pass through a panel. Because the stainless version uses the same dimension tables as the standard part, any bracket designed around the grey POC401 fits unchanged.
Quick checklist
It is a compact one-touch male connector for Dia 4 mm tube on a 1/8 in PT male thread. Working pressure 0-1.0 MPa (0-10 kgf/cm2), proof pressure 1.5 MPa, negative pressure -750 mmHg (10 Torr), temperature -20 to +70 C, for soft nylon or polyurethane tube. The -S variant has a SUS304 stainless, copper-free body; the release button and chuck are POM, with an aluminium-alloy guide, NBR O-ring and stainless spring gasket. These figures match the standard grey POC401 exactly.
No. On POC series parts the D suffix only makes the release button black; it does not alter the body. The -S suffix swaps the body to SUS304 but keeps the identical dimension table, so the thread engagement and tube grip behave the same as the standard version. Always terminate the 1/8 in PT thread on a PT-tapped port and keep the tube OD at exactly 4 mm - the chuck is sized for one diameter only.
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