Airtac PM Panel Mount Straight Coupling PM4
The AirTAC Airtac PM Panel Mount Straight Coupling PM4 is a genuine bulkhead union for push-in tube connection, rated 0 - 1.0 MPa (0 - 10 kgf/cm2) with a 1.5 MPa proof pressure.
- TypeBulkhead union
- SeriesPM
- 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 PM Panel Mount Straight Coupling PM4
The AirTAC PM4 is a resin bulkhead union from the PM family, a tube-to-tube one-touch fitting with no external thread at all in its ordering code. It carries two Dia 4 mm push-in ports, one on each side of the panel or machine wall it is mounted through, and the factory locknut thread on the bulkhead body is M12x1 for this tube size. Push the soft nylon or polyurethane tube into the port until it bottoms; the internal chuck grips the tube wall and the stainless spring gasket seals it. Pressing the release ring frees the tube for removal.
This is the resin spec profile, not the metal BP line: working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum to -750 mmHg (10 Torr), proof pressure 1.5 MPa and a temperature window of -20 to +70 C. The body arrives in grey (no D suffix), and because the model is a union the connection stays inside the enclosure wall - only two tube tails show.
Airtac PM Panel Mount Straight Coupling PM4 Technical Specifications
| Model | Airtac PM Panel Mount Straight Coupling PM4 |
|---|---|
| Type | Bulkhead union |
| Series | PM |
| Connection | Push-in one-touch |
| 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. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac PM Panel Mount Straight Coupling PM4
| PM | Bulkhead union. |
|---|---|
| 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. |
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 PM Panel Mount Straight Coupling PM4 Is Used
Pneumatic control cabinet on a packaging line
Mount the PM4 through the backplate of a machine-mounted air cabinet so the supply from the valve manifold on the outside meets 4 mm distribution tubing to solenoid pilot ports on the inside, without unscrewing anything to service either side.
Lab automation reagent-dispense skid
On a benchtop dispensing skid where 4 mm polyurethane lines feed peristaltic-driven air actuators, the bulkhead union lets the tube enter the sealed electronics compartment through the housing wall while staying releasable for calibration changes.
Robot cell dress-pack pass-through
Use the PM4 as a fixed tube pass-through at the base of a 6-axis robot dress-pack bracket: one 4 mm tail to the valve bank, the other running with the cable loom, with the M12x1 locknut clamping the fitting to a drilled bulkhead hole.
Is the Airtac PM Panel Mount Straight Coupling PM4 the Right Part?
PM4 is the smallest bulkhead union in this catalogue; the PM family does not include the 3.2 mm mini size that exists on PC and PL, so there is nothing below it. The next size up is PM6, which steps the passage to Dia 6 mm and increases the locknut thread from M12x1 to M14x1, giving a stiffer joint for slightly higher flow demand. If you are stepping between two different tube sizes, you need the PG different-diameter straight instead, not the PM. Both ports on a PM4 must be Dia 4 exactly - a Dia 6 fitting will not hold 4 mm tube and vice versa.
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 PM Panel Mount Straight Coupling PM4 FAQ
The PM4 is a one-touch bulkhead union joining two Dia 4 mm soft nylon or polyurethane tubes. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), it holds vacuum to -750 mmHg (10 Torr), proof pressure is 1.5 MPa and the temperature range is -20 to +70 C. The bulkhead locknut thread for Dia 4 is M12x1, and the fitting is grey as standard.
Both ports accept exactly Dia 4 mm outside-diameter tubing - a fitting sized for 6 mm tube will not seal 4 mm tube, so never substitute. The locknut thread is M12x1, so drill the bulkhead hole for that stud size and pass one tube tail through before tightening the nut. AirTAC does not publish a tightening torque for these fittings, so tighten snugly by hand with a spanner and verify no leak at working pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC One-Touch Fittings
Request a Quote for Airtac PM Panel Mount Straight Coupling PM4
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.