Airtac BU Double Female Thread Straight Connector BU0101
The AirTAC Airtac BU Double Female Thread Straight Connector BU0101 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 BU0101
The BU0101 is a double female connector: a short hex-bodied union with a 1/8in PT female thread on each end, used to join two male studs back-to-back in a straight run. Because both ports accept thread, there is no tube involved at all - this is permanent pipe plumbing, made up with a wrench and sealant and then left alone.
It belongs to AirTAC's nickel-plated metal joint family, and that is the whole reason to pick it over a push-in fitting: 3.0 MPa proof pressure (double the resin one-touch range) and a 0 to 150 C working temperature. Around hot ovens, dryers and mould tooling, a resin body softens or bursts; this one does not. It also holds vacuum down to -750 mmHg, so it is safe on suction lines too.
Airtac BU Double Female Thread Straight Connector BU0101 Technical Specifications
| Model | Airtac BU Double Female Thread Straight Connector BU0101 |
|---|---|
| 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 BU0101
| 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 BU0101 Is Used
Plating-line rinsing stations
Copper-free-resistant plumbing matters less than corrosion resistance here: nickel-plated BU0101 unions tie rinse-air purge lines into small 1/8in studs on benchtop tanks, where splash and acid fumes kill bare steel fittings.
Reflow oven cooling-air tees
Solder-reflow ovens run cabinet air well past what a resin fitting tolerates. A 1/8in BU0101 closes the gap between two stub pipes on cooling-air circuits near the heating tunnel without the body creeping at temperature.
Compact valve manifold blanks-to-joints
Small pneumatic valve islands and solenoid pilot blocks use 1/8in ports. Where two ported blocks sit side by side, a short BU0101 bridges them rigidly instead of adding a nipple-and-socket stack that can leak at each extra joint.
Is the Airtac BU Double Female Thread Straight Connector BU0101 the Right Part?
BU0101 is the smallest part in the BU ladder. It steps up to BU0202 (1/4in), then BU0303 (3/8in) and BU0404 (1/2in); BU exists only in equal-size pairs, so a reducing union is not on the menu here - if your two threads differ, look at the BD male-female range instead. Step up to BU0202 when the circuit carries real volume or you want a stiffer joint less likely to shear under vibration.
If one of your two studs is actually a hose tail or you need to get a wrench between two obstructions, a BB0101 male-male connector or a BD0102 female-male adapter may route the joint more cleanly than a back-to-back union. The BU shape wins where two existing male ports already face each other and you just need to close the gap.
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 BU0101 FAQ
Thread: 1/8in PT female on both ends (PT is the only standard offered on this range). Working pressure: 0 to 1.0 MPa. Vacuum: down to -750 mmHg. Proof pressure: 3.0 MPa. Temperature: 0 to 150 C, so the body outlasts any push-in resin fitting near heat - though always confirm your pipe or sealant is rated for the same temperature. Body finish: nickel-plated. No flow figure is published for this family; capacity follows the 1/8in port bore.
Both ends are identical 1/8in female PT ports, so there is no orientation to get wrong - just wind PTFE tape or apply pipe sealant to both male studs and thread the union onto each. AirTAC publishes no tightening torque for this family, so tighten like any standard PT pipe joint: snug, then a further quarter to half turn to seat the taper. Do not overwrench a 1/8in body; it is the smallest union in the BU ladder and cracks from overtightening, not pressure, are the realistic failure.
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