Airtac BZ External Hex Plug BZ03-S
SUS304 stainless variant (-S)The AirTAC Airtac BZ External Hex Plug BZ03-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 BZ03-S
BZ03-S is the SUS304 stainless version of AirTAC's BZ hexagon head cap plug. It is a pure blank: one 3/8in PT male thread on a hex head and nothing else, made to close an unused port on a valve, cylinder, filter or manifold permanently rather than leaving it open or taping it over. There is no tube, no seal cartridge and no moving part - turn the hex with a standard wrench and the port is sealed.
The rating profile is what separates this family from resin one-touch hardware: 3.0 MPa proof pressure, 0-1.0 MPa working pressure, vacuum capability down to -750 mmHg and a 0 to 150 C window. In -S form the entire body is SUS304 rather than plated, which brings corrosion resistance for wash-down and marine plant plus copper-free construction for plating lines, electronics and certain food or medical processes where copper contamination is a concern.
Airtac BZ External Hex Plug BZ03-S Technical Specifications
| Model | Airtac BZ External Hex Plug BZ03-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 BZ03-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 BZ03-S Is Used
Thermoformer vacuum manifold blanking
Spare ports on the vacuum manifold of a thermoforming machine sit close to heated moulds where resin caps soften and crack. A SUS304 plug holds 150 C and -750 mmHg vacuum without creeping loose.
Bottling line wash-down sealing
Unused gauge ports on a conveyor air manifold in a bottling plant's caustic wash zone stay capped through daily hose-downs. The solid stainless body does not rely on plating to survive the chemicals.
Plating line process air ports
Copper-free SUS304 construction keeps copper ions out of the picture when plugging pneumatic ports on fixtures near plating tanks, where dissolved copper can catalyse bath chemistry.
Is the Airtac BZ External Hex Plug BZ03-S the Right Part?
The BZ ladder runs BZ01 (1/8in), BZ02 (1/4in), BZ03 (3/8in) and BZ04 (1/2in), all PT. Step down to BZ02-S for a 1/4in port or up to BZ04-S for a 1/2in port; the female port you are blanking decides the choice, and nothing else does. Note the thread is PT taper - it will not seal correctly in an NPT or G port.
A BZ plug is the honest answer to a spare port: if the port is needed again later, unscrew the plug and it is back in service. If you actually need to pass air through rather than blank it, move to the BB male connector or BU double female range in the same stainless finish instead of improvising with a plug.
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-S FAQ
Working pressure 0-1.0 MPa, proof pressure 3.0 MPa, vacuum capability -750 mmHg, temperature range 0 to 150 C. The part is a hexagon head cap plug with a single 3/8in PT male thread, and the whole body is SUS304 stainless steel. It carries no tube and contains no flow path - its only job is to blank a port.
The thread is PT taper, so wrap PTFE tape or apply a suitable pipe sealant to the male thread before screwing it into the female port, then turn the hex with a wrench until the joint seals. AirTAC publishes no tightening torque for this family, so tighten progressively and check under pressure. Note that PT will not mate reliably with NPT or G threads, and the plug can simply be unscrewed later if the port is needed again.
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