Airtac BZ External Hex Plug BZ04-S
SUS304 stainless variant (-S)The AirTAC Airtac BZ External Hex Plug BZ04-S 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-S
The BZ04-S is AirTAC's SUS304 stainless hexagon head cap plug, the largest of the four BZ sizes. It carries a single PT 1/2in male thread and does one job: it screws into a port and blanks it off for good. There is no tube on this part, no second thread and nothing to connect - it is the honest answer whenever a manifold, valve block or actuator has a port the circuit simply does not use.
Because this family is machined metal rather than a resin one-touch body, the rating is far higher than push-in fittings can offer: 3.0 MPa proof pressure (double the one-touch figure), 0-1.0 MPa working pressure with -750 mmHg vacuum capability, and a service temperature of 0 to +150 C. In SUS304 throughout, it suits wash-down plant and any circuit where a plated brass plug would corrode or where copper-free construction matters. Note that AirTAC publishes PT taper thread only on this family - there is no NPT or G option.
Airtac BZ External Hex Plug BZ04-S Technical Specifications
| Model | Airtac BZ External Hex Plug BZ04-S |
|---|---|
| Type | Hexagon head cap plug |
| Series | BZ |
| Connection | Threaded both ends |
| 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 | 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. Stainless (-S): SUS304 body throughout, for copper-free and corrosive environments. Pressure and temperature ratings are unchanged from the nickel-plated version. 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-S
| 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. |
| -S | Stainless-steel body. |
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-S Is Used
Food wash-down manifolds
On a food-line pneumatic manifold that is hosed down daily, an open or plated port becomes a corrosion and hygiene point. A solid SUS304 1/2in plug blanks it permanently and survives the 0 to 150 C cycle of a hot caustic-adjacent area.
Mould temperature control circuits
Mould temperature controllers and hot-runner rigs run air lines near heated platens where resin push-in fittings creep. A SUS304 PT 1/2in plug closes a spare gauge port on these circuits without a temperature or pressure compromise.
High-pressure test benches
When a test bench is proofed to 3.0 MPa, every unused port needs a plug rated for the same proof pressure. The BZ04-S matches the circuit's 3.0 MPa proof figure, which is exactly why it appears on hydraulic-adjacent pneumatic test rigs.
Is the Airtac BZ External Hex Plug BZ04-S the Right Part?
04 is the top of the BZ ladder, so the only real neighbour is BZ03 one size down at PT 3/8in. Stepping down trades a little port size for a smaller hex - check the unused port's actual thread before ordering, because a 1/2in plug in a 3/8in port will not seal no matter how much tape is applied. There is no larger BZ; if a port bigger than PT 1/2in must be blanked, you are outside this series.
The code is deliberately short: BZ takes one thread code only (01 = 1/8in, 02 = 1/4in, 03 = 3/8in, 04 = 1/2in), unlike the BB and BD connectors whose codes pair two threads. If you need a blanking piece with a different thread each end, that does not exist here - you need a connector plus a plug, or a BD. Seal the taper thread with a compatible thread sealant; AirTAC publishes no tightening torque for this family, so tighten to a sound metal-to-metal hex seating rather than a quoted figure.
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-S FAQ
The BZ04-S is a SUS304 hexagon head cap plug with a single PT 1/2in male thread (thread code 04). Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure capability is -750 mmHg (10 Torr), proof pressure is 3.0 MPa and the temperature range is 0 to +150 C. AirTAC publishes PT taper thread only on this family - no NPT or G variant exists.
Thread it into the unused port with a wrench on the hex flats and seal the PT taper thread with a thread sealant rated for the circuit temperature - the plug itself is metal in SUS304 and takes 0 to +150 C, but a low-temperature paste or tape is the usual weak link, so choose the sealant for the job. AirTAC does not publish a tightening torque for this family; tighten until the taper seats solidly on the hex. Remember the whole circuit is limited by its weakest part, so check the tubing and hose ratings too.
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