Airtac BZ External Hex Plug BZ03
The AirTAC Airtac BZ External Hex Plug BZ03 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 BZ03
The BZ03 is a hexagon head cap plug with a single male PT 3/8" thread and nothing else - its whole job is to close off a port you are not using. Unlike every other part in this connector family it has no second thread and no tube path, so it simply seals a tapped opening in a valve body, manifold or cylinder head.
It belongs on metal-fitting circuits for two reasons AirTAC publishes plainly: the family carries a 3.0 MPa proof pressure (double the resin one-touch figure) and a working temperature of 0 to 150 C with a nickel-plated body. That is why a BZ plug shows up on hot-air lines, near dryers and ovens and on steam-adjacent plant, where a plastic plug would soften or creep. It also holds vacuum, rated down to -750 mmHg (10 Torr).
Airtac BZ External Hex Plug BZ03 Technical Specifications
| Model | Airtac BZ External Hex Plug BZ03 |
|---|---|
| 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 BZ03
| 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 BZ03 Is Used
Spare port on a mould temperature controller
Moulding tools often carry unused gauge or thermocouple-adjacent ports on their pneumatic manifold. A BZ03 seals a spare 3/8" PT opening on a manifold sitting close to the hot half, where the 150 C rating matters and a resin cap would not survive.
Unused outlet on a dryer air receiver
Compressed-air receivers and aftercooler assemblies leave drained or capped tappings. This plug closes a 3/8" PT port on such a vessel in the hot zone downstream of a refrigerated or desiccant dryer, holding both 1.0 MPa working pressure and vacuum-backed shutdown conditions.
Trailer brake and auxiliary air plumbing
Commercial vehicle air systems carry tapped galleries and valve blocks with ports left over from optional equipment. A BZ03 blanks an unused 3/8" PT opening permanently, and the hex head lets a workshop unseal it with a key when the circuit is later activated.
Is the Airtac BZ External Hex Plug BZ03 the Right Part?
BZ plugs come in four sizes and this is the second from the top: step down to BZ02 for a 1/4" port or up to BZ04 for a 1/2" port; below that, BZ01 covers 1/8". Match the plug to the tapped hole, not to the pipe run - a port blanked with the wrong taper thread size is the classic leak source. All threads in this family are PT; there is no NPT or G variant.
If the spare port might be needed later, a plug is still the honest answer: it seals cleanly and can be removed with a hex key on the head when the circuit is extended. Do not try to cap a port with a male connector plus a junk tube stub - the BZ03 does that job with one part and one joint fewer to leak.
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 BZ03 FAQ
The BZ03 is a hexagon head cap plug with a male PT 3/8" thread. Working pressure is 0 to 1.0 MPa (0 to 10 kgf/cm2), it holds vacuum to -750 mmHg (10 Torr), proof pressure is 3.0 MPa, and the permitted temperature range is 0 to +150 C. The body is nickel plated. Only the thread size changes across the BZ range - the ratings are identical for BZ01 through BZ04.
The thread is PT taper, so sealing comes from thread engagement, not a gasket. Wrap the male thread with seal tape or apply a thread sealant and run the plug in until hand-tight, then finish with a hex wrench on the head. AirTAC publishes no tightening torque for this part, so tighten to a sound, sealed engagement rather than to a stated figure - overtightening a taper thread in a casting can crack the port.
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