The AirTAC Airtac POC Round Thread Straight Connector POC4M5-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 POC4M5-S is AirTAC's compact one-touch male connector in the stainless steel 304 version. It joins Dia 4 mm soft nylon or polyurethane tubing to an M5x0.8 male thread. Unlike the standard grey POC, the entire body here is machined from SUS304 and AirTAC states that all parts of this straight-connector variant are copper-free, which is why it gets specified wherever dissolved copper would upset a process. The release button and chuck stay POM, backed by an aluminium-alloy guide, a stainless spring gasket and an NBR O-ring.
Connection works the usual one-touch way: push the tube squarely into the chuck until it bottoms, the grip ring and seal hold it under pressure, and pressing the release ring lets it slide free. Ratings are unchanged from the resin line - 0 to 1.0 MPa working pressure, -750 mmHg (10 Torr) vacuum, 1.5 MPa proof pressure and -20 to +70 C. One detail that matters on this size: M5 threads arrive with a sealing gasket rather than pre-applied thread sealant, so the seal is made at the gasket face.
| Model | Airtac POC Round Thread Straight Connector POC4M5-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. |
Plating baths and rinse stations use M5 ports on conductivity and level sensors; the SUS304 body and copper-free internals resist splashed chemistry and keep stray copper out of the bath.
Compact pneumatic ejectors on SMD handling heads commonly carry M5 ports; a 4 mm tube run to the cup side keeps the end effector light where every gram affects cycle time.
Test fixtures with small air cylinders on M5 ports take this connector directly into the cylinder head, and the 4 mm tube routes cleanly through Aluminium extrusion slots.
Dia 4 mm is the smallest tube the POC M5 ladder offers - there is no step down, only up to Dia 6 (POC6M5-S), which trades a little flow capacity and flexibility for a stiffer, higher-capacity line. Keep the tube OD exact: a Dia 4 fitting will not seal on 5/32 inch or any other nominal tube, and nothing in this catalogue is imperial. Match the M5 port to components that actually carry one - small valve manifolds, miniature cylinders, pressure switches and flow controls are the usual M5 hosts.
If you need a female thread or a 90-degree turn at the same port, the stainless range covers POCF female and PL elbows separately; this SKU is the straight-in male stud.
Quick checklist
It is the SUS304 compact male connector for Dia 4 mm tubing on an M5x0.8 thread. 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. The stainless body and copper-free construction do not change any of these figures from the standard POC, and the M5 seal is made by a gasket.
No on both counts. The chuck grips Dia 4 mm tube only - tube OD must match exactly or the seal and grip ring will not engage. The thread is fixed at M5x0.8; if your port is PT 1/8, the stainless PC401-S is the straight connector to look at instead, and it supports the same 4 mm tube on that larger port.
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