Airtac BB Double Male Thread Straight Connector BB0304-S
SUS304 stainless variant (-S)The AirTAC Airtac BB Double Male Thread Straight Connector BB0304-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 BB0304-S
The BB0304-S is a straight male connector machined throughout in SUS304 stainless steel: PT 3/8 male thread on one side, PT 1/2 male thread on the other, joining a half-inch supply leg to a three-eighths branch without any intermediate adapter. Because both ends are external threads, the part carries no tube at all - it is pipework, screwed together and left in place.
This family sits where resin one-touch fittings cannot. Proof pressure is 3.0 MPa, working pressure runs 0-1.0 MPa with vacuum down to -750 mmHg (10 Torr), and the rated temperature window is 0 to +150 C. The -S suffix swaps the standard nickel-plated body for solid SUS304, which makes the connector copper-free - the reason plating lines and electronics process engineers specify it. Confirm the tube or hose temperature rating separately; the joint is rarely the limiting component.
Airtac BB Double Male Thread Straight Connector BB0304-S Technical Specifications
| Model | Airtac BB Double Male Thread Straight Connector BB0304-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 BB0304-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 BB0304-S Is Used
Trailer brake and suspension feed lines
Commercial vehicle auxiliary air circuits run at high proof margins for safety. A PT 3/8 to 1/2 steel-piped step-up joint in SUS304 survives road salt spray that would eat plated brass within seasons.
Electroplating rinse-tank actuation
Plating line cylinder feeds sit in acid mist. A copper-free SUS304 body avoids copper-ion contamination of the bath chemistry, which is precisely why this -S variant is specified over the standard connector.
Glass-lehr oven door cylinder supply
Float-glass lehrs keep actuator plumbing at well over 100 C near the annealing hood. The 0 to 150 C rating and 3.0 MPa proof of the BB0304-S let the 1/2 header feed 3/8 drops without a resin fitting in sight.
Is the Airtac BB Double Male Thread Straight Connector BB0304-S the Right Part?
You are at the top of the 3/8 ladder. Step down to BB0303 for a 3/8 to 3/8 straight-through join if the supply side is also half-lumped at 3/8; step up to BB0404 for a full 1/2 to 1/2 run. Going from 0303 to 0304 buys you the larger 1/2 inlet bore on the upstream side, which matters when several 3/8 branches draw from one header. If the equipment port is a female 1/2 socket rather than a male stud, BD0304 does the same 3/8 x 1/2 changeover with a female end and saves a nut-and-nipple pair. No NPT or G variants exist in this series - PT is the only thread form, so seal accordingly.
Note on orientation: AirTAC's code and its dimension drawing do not clearly fix which physical end carries Thread I, so plan your pipework so either end can face either way.
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-S FAQ
It is a straight male-to-male pipe connector with PT 3/8 on one end and PT 1/2 on the other, machined entirely in SUS304 stainless steel. Working pressure is 0-1.0 MPa (0-10 kgf/cm2), vacuum capability is -750 mmHg (10 Torr), proof pressure is 3.0 MPa, and the rated temperature range is 0 to +150 C. No flow coefficient is published; capacity follows the thread bore.
PT is a taper thread and seals on the thread flanks, so apply sealant tape or liquid pipe sealant to the male thread before screwing in - do not rely on an O-ring, as there is none. The SUS304 body is harder than brass, so a fraction more tape than usual prevents weeping. AirTAC publishes no tightening torque for this part; tighten to a sound, leak-free joint by conventional practice and pressure-test before commissioning.
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