Airtac BB Double Male Thread Straight Connector BB0304
The AirTAC Airtac BB Double Male Thread Straight Connector BB0304 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 BB0304
The BB0304 is a reducing male connector: a nickel-plated hex-bodied fitting with a male PT thread at each end, stepping a 1/2in main line down onto a 3/8in branch or component port. Both threads are PT (taper) as standard, and because the body is all metal it is made up once with a wrench and left in place rather than re-connected by hand.
This family is specified where a push-in resin fitting would be the weak point. Proof pressure is 3.0 MPa - twice the one-touch figure - the working range is 0-1.0 MPa with vacuum to -750 mmHg, and the temperature envelope is 0 to +150 C. That is why this connector shows up on air lines running past heated platens, dryers and steam-heated equipment, provided the tube or hose on the other end is itself rated for the temperature.
Airtac BB Double Male Thread Straight Connector BB0304 Technical Specifications
| Model | Airtac BB Double Male Thread Straight Connector BB0304 |
|---|---|
| Type | Male / male connector |
| Series | BB |
| 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 BB Double Male Thread Straight Connector BB0304
| 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. |
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 BB0304 Is Used
Trailer brake-line adaptors
A 1/2in tank line stepping down to 3/8in runs feeding tractor brake valves. The 3.0 MPa proof figure gives margin against surge when the compressor governor unloads, and the all-metal body tolerates the engine-bay heat a resin connector would not.
Steam-heated laundry calenders
Instrument air tapped off a 1/2in header into 3/8in gauge lines beside rotary-press steam joints. The 150 C rating covers the radiant zone where the machine's own one-touch thermoplastic fittings have to be routed away.
Lab autoclave and sterilizer services
Compressed-air and vacuum take-offs on autoclave door-seal circuits, running 1/2in supply down to 3/8in valve ports. The connector holds -750 mmHg on the vacuum side and survives the cabinet skin temperature without softening.
Is the Airtac BB Double Male Thread Straight Connector BB0304 the Right Part?
Step down one rung and the BB0203 (1/4in x 3/8in) does the same job with the small side reduced to 1/4in; step up and there is no BB0405, so the ladder ends at the BB0404, which is 1/2in on both ends. If your two ports are both 3/8in, the straight-through BB0303 saves the step entirely. Check that the 1/2in side is genuinely the supply side of the circuit before ordering - with the 04 number first in the code this part is aimed at making a 1/2in line down to a 3/8in take-off.
If one of the two ports is female, a BD0304 (female Thread I, male Thread II) removes the need for a separate reducing bushing. And keep in mind the code does not reliably tell you which physical end carries which size - size the threads from your piping, not from the drawing orientation.
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 BB0304 FAQ
The BB0304 is a male-to-male reducing connector with PT threads, 3/8in on one side and 1/2in on the other. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), negative pressure to -750 mmHg (10 Torr), proof pressure 3.0 MPa, and the operating temperature range is 0 to +150 C. The body is nickel-plated metal. Note AirTAC publishes no tightening torque and no flow figure for this part - seal the PT threads with tape or paste and judge capacity by the 3/8in restriction.
Wrap the male PT threads with sealant tape or apply thread sealant, then wrench the fitting into the female ports - AirTAC does not publish a torque value, so tighten to a sound metal joint and leak-test. The code lists 3/8in then 1/2in, but the datasheet does not clearly assign these to a physical end of the fitting, so verify both threads with a gauge rather than trusting orientation. Removing it later is simply a matter of unscrewing - there is no release collar as on a push-in fitting.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard parts are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Pipe Joints
Request a Quote for Airtac BB Double Male Thread Straight Connector BB0304
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.