Airtac BB Double Male Thread Straight Connector BB0303-S
SUS304 stainless variant (-S)The AirTAC Airtac BB Double Male Thread Straight Connector BB0303-S is a genuine male / male connector rated to 3.0 MPa proof pressure and 0 to +150 °C, for joining threaded pipe runs.
- TypeMale / male connector
- SeriesBB
- 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 BB Double Male Thread Straight Connector BB0303-S
The BB0303-S is a straight male connector with a 3/8in PT male thread on each end, machined in SUS304 stainless steel rather than the standard nickel-plated finish. Because both threads are the same size, it splices two equal 3/8in lines without any reducing step, and with a symmetric part you never have to worry about which end faces which - Thread I and Thread II are identical here.
This family is built for conditions that defeat one-touch resin fittings: 3.0 MPa proof pressure (double the resin line), 0 to +150 C service, and vacuum down to -750 mmHg. In the -S execution the whole body is stainless 304, which adds copper-free construction for processes where copper contamination matters, such as plating baths or electronics wash lines. AirTAC publishes no separate rating for the stainless version - the pressure, temperature and dimensions match the plated BB0303 exactly.
Airtac BB Double Male Thread Straight Connector BB0303-S Technical Specifications
| Model | Airtac BB Double Male Thread Straight Connector BB0303-S |
|---|---|
| Type | Male / male connector |
| Series | BB |
| 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 BB Double Male Thread Straight Connector BB0303-S
| BB | Male / male connector. |
|---|---|
| 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 BB Double Male Thread Straight Connector BB0303-S Is Used
Electroplating line air lines
Copper-free SUS304 stands up to plating-bath mist that attacks plated fittings, making this a sound splice between 3/8in branches feeding rinsing and agitation nozzles.
Bakery rack oven actuation
Cylinder and damper lines running alongside a commercial rack oven stay well within the 0 to +150 C envelope, where a push-in resin fitting would soften and blow off.
Injection mould tool circuits
A permanent 3/8in splice routed close to the mould surface on a hot-runner or core-cooling circuit survives the 3.0 MPa proof test and repeated heat soak.
Is the Airtac BB Double Male Thread Straight Connector BB0303-S the Right Part?
You are at a mid rung of the BB ladder. Step down to BB0203 for a 1/4in to 3/8in reduction, or up to BB0304 to reach 1/2in; if you want to stay at 3/8in but shrink one side, that does not exist as a BB - the closest parts are BB0203 (down) and BB0304 (up). Equal-size alternatives are BB0202 for a 1/4in to 1/4in splice and BB0404 for 1/2in to 1/2in.
Choose this -S version over the plated BB0303 when the line sees wash-down, salt-laden air, plating mist or repeated hot cycles that strip nickel plating over time. If one port is female, a BD0304-style male-female connector can replace this plus a separate nipple; if you are capping an unused 3/8in port instead of joining lines, BZ03 is the honest part. Flow capacity is published only as a characteristic curve - size by the full 3/8in bore, not by a catalogue number.
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 BB Double Male Thread Straight Connector BB0303-S FAQ
It is a SUS304 stainless male connector with a 3/8in PT male thread on both ends. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 3.0 MPa, and service temperature 0 to +150 C. Ratings and dimensions are identical to the plated BB0303 - the stainless body changes corrosion behaviour, not performance figures.
Threads are PT (taper pipe thread) - the code has no separate thread-standard suffix, and PT is the only standard offered in this family, so no NPT or G version exists. Seal the threads with PTFE tape or an appropriate pipe sealant; AirTAC publishes no tightening torque for this part, so tighten to a sound metal-to-metal taper fit and pressure-test before closing the line. No tube is involved - both ends are threads.
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