Airtac BZ External Hex Plug BZ04
The AirTAC Airtac BZ External Hex Plug BZ04 is a genuine hexagon head cap plug rated to 3.0 MPa proof pressure and 0 to +150 °C, for joining threaded pipe runs.
- TypeHexagon head cap plug
- SeriesBZ
- Working pressure0 - 1.0 MPa (0 - 10 kgf/cm2)
- Proof pressure3.0 MPa
- Temperature0 to +150 °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 BZ External Hex Plug BZ04
The BZ04 is a hexagon head cap plug: a short, hex-driven blanking screw with a PT 1/2in male thread and nothing on the other end. Its single job is to close an unused 1/2in port on a manifold block, valve plate or cylinder head so the circuit stays tight instead of leaking through an opening nobody planned for.
It belongs to AirTAC's nickel-plated metal connector family, and that family carries figures the push-in resin fittings cannot match: a proof pressure of 3.0 MPa and a working temperature of 0 to +150 C, with working pressure of 0-1.0 MPa and vacuum capability down to -750 mmHg. That is why a metal plug like this shows up on hot equipment where a plastic plug would soften, creep or crack.
Airtac BZ External Hex Plug BZ04 Technical Specifications
| Model | Airtac BZ External Hex Plug BZ04 |
|---|---|
| Type | Hexagon head cap plug |
| Series | BZ |
| Connection | Threaded both ends |
| Working pressure | 0 - 1.0 MPa (0 - 10 kgf/cm2) |
|---|---|
| Negative pressure | -750 mmHg (10 Torr) |
| Proof pressure | 3.0 MPa |
| Temperature | 0 to +150 °C |
| Thread standard | PT (Rc tapered) unless the code says otherwise |
Nickel-plated metal body. AirTAC does not publish a per-part material breakdown for this family. This family is rated to 150 °C, but the TUBE is usually the limit - confirm your tubing's temperature rating before running it hot. AirTAC publishes flow as a characteristic curve rather than a single figure, so no L/min value is listed.
Model Code: Airtac BZ External Hex Plug BZ04
| BZ | Hexagon head cap plug. |
|---|---|
| 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 BZ External Hex Plug BZ04 Is Used
Injection mould tool manifolds
Close spare 1/2in ports on an ejection or core-pull air manifold bolted to a moulding tool, where cavity heat rules out a plastic plug and the 3.0 MPa proof pressure covers pressure spikes during blow-off.
Steam-heated rotary dryers
Plug unused gauge and thermocouple-adjacent air tappings on a rotary dryer cabinet running near 150 C, where the nickel-plated metal body survives the hot zone that cracks resin caps.
Laboratory autoclave services
Seal instrumentation ports on steam-adjacent steriliser and autoclave plumbing at 1/2in size, keeping the circuit clean under vacuum down to -750 mmHg as well as under pressure.
Is the Airtac BZ External Hex Plug BZ04 the Right Part?
BZ04 is the top of the BZ ladder, so the only neighbouring size that exists is BZ03 at 3/8in below it - step down to that when the spare port is a 3/8in tapping, and note that both plugs blank the same way, only the thread engagement and port scale change. At the small end, BZ01 (1/8in) and BZ02 (1/4in) cover the compact manifold ports. If the opening is 1/2in and will never be used, BZ04 is the honest answer; a BB or BD connector plus a blind adapter is a heavier, costlier way to achieve the same seal.
One practical note AirTAC leaves to the installer: no tightening torque is published for this family, so torque is set by the fitter using normal practice for the PT tapered thread, which seals through thread interference.
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 0 to +150 °C
Airtac BZ External Hex Plug BZ04 FAQ
BZ04 is a hexagon head cap plug with a PT 1/2in male thread and no tube connection. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), vacuum capability is -750 mmHg (10 Torr), proof pressure is 3.0 MPa, and the working temperature range is 0 to +150 C. The body is nickel plated. It is the largest size in the BZ range, which runs from BZ01 (1/8in) to BZ04 (1/2in).
Thread it straight into the 1/2in PT port and turn the hexagon head with a wrench until the tapered thread beds in; PT threads seal by interference, so fitters commonly add PTFE tape or thread sealant as normal practice. AirTAC publishes no tightening torque for this family, so tighten to sound judgement rather than a datasheet figure. Because it is a solid plug, removal just needs the same wrench - useful if the port is ever brought back into service.
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