Airtac PM Panel Mount Straight Coupling PM4D
The AirTAC Airtac PM Panel Mount Straight Coupling PM4D 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 PM4D
The PM4D is an AirTAC PM bulkhead union, the smallest size in the PM ladder, made to carry a Dia 4 mm tube through a panel or machine wall. It is a tube-to-tube union, not a threaded connector: the same 4 mm line continues on both sides of the bulkhead, so no port thread and no secondary fitting are involved. The part is clamped in place by an M12x1 locknut, which is the standard locknut thread AirTAC assigns to Dia 4 tube on all bulkhead families.
This is a resin and brass one-touch part, so the spec profile is 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. To make the joint you push the soft nylon or PU tube home until the internal chuck grips it; pressing the POM release ring frees it again. The release button, chuck and guide are POM and aluminium alloy with an NBR O-ring. The D suffix makes the body black rather than the standard grey - on PM the whole body changes colour, unlike PC and POC where D only affects the release button.
Airtac PM Panel Mount Straight Coupling PM4D Technical Specifications
| Model | Airtac PM Panel Mount Straight Coupling PM4D |
|---|---|
| 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 PM4D
| 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 PM4D Is Used
Pilot line through a control cabinet wall
Feeding a 4 mm pilot or sensor line from outside an electrical enclosure to a valve island inside, with the PM4D carrying the tube through the sheet-metal wall on its M12x1 locknut.
Packaging machine guard pass-through
Routing an air signal through the guard panel of a small blister or cartoning machine so the tube can be disconnected from outside without opening the guard.
Lab enclosure air assist
Passing a 4 mm purge or air-assist line through the side of a laboratory hood or instrument enclosure, keeping the connection inside tidy and tool-free.
Is the Airtac PM Panel Mount Straight Coupling PM4D the Right Part?
Dia 4 is the smallest tube size AirTAC offers in the PM bulkhead family, so there is no smaller neighbour to step down to. The next size up is Dia 6 (PM6): it moves you to an M14x1 locknut and suits heavier actuator feeds, while the PM4D is aimed at signal and pilot lines. If you later need Dia 8, 10 or 12, the locknut grows to M16x1, M20x1 or M22x1, so the panel hole must be re-planned with the size change.
Tube OD must match exactly: a Dia 4 one-touch chuck will not seal on 1/8 inch (3.2 mm) or 5/32 inch tube, even though the difference is under a millimetre. Because this is a union, plan the panel cut-out around the M12x1 nut, not around a threaded port - there is no male or female pipe thread anywhere on the PM4D.
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 PM4D FAQ
Tube size Dia 4 mm on both sides, bulkhead locknut thread M12x1. Working pressure 0-1.0 MPa (0-10 kgf/cm2), vacuum down to -750 mmHg (10 Torr), proof pressure 1.5 MPa, operating temperature -20 to +70 C. Use soft nylon or polyurethane tube of exactly 4 mm OD.
No. The PM4D is a bulkhead union, so both sides accept 4 mm tube and there is no pipe thread on the part at all. The only thread is the M12x1 locknut that clamps the fitting to the panel. If you need a threaded port plus a bulkhead mounting, look at the PMF bulkhead connector instead, which combines the panel locknut with an external male thread.
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