Airtac BU Double Female Thread Straight Connector BU0303
The AirTAC Airtac BU Double Female Thread Straight Connector BU0303 is a genuine double female connector rated to 3.0 MPa proof pressure and 0 to +150 °C, for joining threaded pipe runs.
- TypeDouble female connector
- SeriesBU
- 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 BU Double Female Thread Straight Connector BU0303
The BU0303 is a double female connector: a short nickel-plated coupling with a 3/8in PT female thread on each end, made to screw onto two male studs, nipples or sensor stems and tie them into one continuous air path. It is a thread-to-thread part with no tube involved, so nothing is pushed in or clamped - the seal is made entirely on the two taper threads.
This metal family is built for conditions that stop a resin one-touch fitting cold: 0-1.0 MPa working pressure, 3.0 MPa proof pressure and a 0 to 150 C temperature range, with a -750 mmHg (10 Torr) vacuum rating on top. The BU pattern exists only as a same-size pair - the two female ports are always identical - which makes it the simplest way to extend or repair a run through a female-threaded junction.
Airtac BU Double Female Thread Straight Connector BU0303 Technical Specifications
| Model | Airtac BU Double Female Thread Straight Connector BU0303 |
|---|---|
| Type | Double female connector |
| Series | BU |
| 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 BU Double Female Thread Straight Connector BU0303
| BU | Double female 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. |
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 BU Double Female Thread Straight Connector BU0303 Is Used
Injection moulding hot-side air
Bridges 3/8in female ports between heated mould plates and manifold blocks, where operator-side heat would soften a push-in resin fitting long before the 150 C ceiling of this nickel-plated coupling.
Textile stenter and dryer lines
Ties instrument-air drops onto steam-heated stenter frames and drying cylinders, where frame-mounted female taps sit close to hot fabric and cylinders and demand a metal joint with a 3.0 MPa proof margin.
Vacuum hold-down on machining fixtures
Joins fixture ports to vacuum plumbing on CNC clamping tables: the -750 mmHg (10 Torr) rating lets this same 3/8in coupling serve both the vacuum side and the compressed-air blow-off side of the fixture.
Is the Airtac BU Double Female Thread Straight Connector BU0303 the Right Part?
Step down to BU0202 for 1/4in circuits or up to BU0404 for 1/2in mains; at 3/8in this is the middle of the ladder, and each step changes the port you can land on rather than the rating, which stays 0-1.0 MPa and 150 C across the whole range. If one side of your joint must land on a female port instead, the BD male-and-female series covers 3/8in combinations such as 0203 and 0304.
Where both ends are male threads, BB0303 is the direct male-to-male alternative to this part. And when the problem is a spare tapped port on a manifold rather than a joint to make, a BZ03 hexagon head plug is the honest fix - blanking the port beats capping it with an open coupling.
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 BU Double Female Thread Straight Connector BU0303 FAQ
It is a double female connector with a 3/8in PT female thread on both ends. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure is -750 mmHg (10 Torr), proof pressure is 3.0 MPa and the temperature range is 0 to 150 C. The body is nickel plated. It contains no tube connection - both ends are threads.
PT is a taper thread, so wrap seal tape on the male parts you are screwing in, keep it clear of the first thread to avoid shredding tape into the air line, and tighten both ends firmly. Because each end is a separate taper joint, check them individually after pressurising - a leak on a BU coupling is always at one of the two male threads it is holding, never in the coupling body itself.
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