Airtac BB Double Male Thread Straight Connector BB0404-S
SUS304 stainless variant (-S)The AirTAC BB Double Male Thread Straight Connector BB0404-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 BB0404-S
BB0404-S is a straight male connector in AirTAC's stainless pipe-joint family: a short SUS304 body with a male 1/2in PT thread on each end, used to tie two female ports of the same size directly together with no reduction, no bulkhead and no tube in between. Nothing here is a push-in part - the joint is made up once with sealant tape on the taper threads and stays made.
Like the whole BB/BD/BU/BZ/BKC family, it is rated for 0-1.0 MPa working pressure, -750 mmHg vacuum, 3.0 MPa proof pressure and 0 to +150 C - figures that resin one-touch fittings never reach. The -S suffix changes the material, not the numbers: body and threads are solid SUS304 throughout, giving a copper-free construction for wash-down, marine, plating and electronics work, with no surface plating to chip or flake in hot wet air.
Airtac BB Double Male Thread Straight Connector BB0404-S Technical Specifications
| Model | Airtac BB Double Male Thread Straight Connector BB0404-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 BB0404-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 BB0404-S Is Used
Bakery oven and food dryer air circuits
Air lines feeding burner zones and product dryers sit well above the 70 C limit of resin push-in fittings. A 1/2in BB0404-S keeps the joint metallic all the way to 150 C and survives daily hose-down washes without plated surfaces lifting.
Plating line rinse and actuation air
Copper-free SUS304 matters on plating and chemical plant, where copper ions catalyse unwanted reactions. This copper-free connector joins 1/2in ports in corrosive fume zones where a plated brass joint would pit and fail.
Injection moulding tool and hot-runner services
Mould tools and hot-runner manifolds carry compressed air and cooling services right against heated plates. A permanent 1/2in threaded joint rated to 3.0 MPa proof removes the creep and blow-off risk of push-in fittings on the hot side.
Is the Airtac BB Double Male Thread Straight Connector BB0404-S the Right Part?
Sizing below: BB0304 (3/8in x 1/2in) is the one step down in the BB ladder, and stepping to it halves the thread engagement on the upstream side. Sizing up: 0404 is already the largest male-male combination AirTAC publishes in this series, so there is no bigger BB - if the circuit needs 3/4in ports you must change fitting family, not just size code. For a same-size female-to-female joint at 1/2in, BU0404 is the matching alternative.
If one end is female and one male at unequal sizes, BD0304 (female 3/8in, male 1/2in) does the job of a BB0304 plus a separate reducing adapter in one part. And if you are simply closing an unused 1/2in port on a valve or manifold, the honest answer is not this connector at all but the BZ04 hexagon head cap plug, which blanks the port with a single threaded part.
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 BB0404-S FAQ
Working pressure 0-1.0 MPa (0-10 kgf/cm2), usable under vacuum to -750 mmHg (10 Torr), proof pressure 3.0 MPa, and a temperature range of 0 to +150 C. This part is a straight male connector with a 1/2in PT male thread on each end, and the -S variant is SUS304 stainless throughout. Those figures are identical to the standard plated BB0404 - stainless does not re-rate the part.
No - the procedure is the same as the plated version. Wind sealant tape or apply thread compound to the PT taper threads, screw the connector into both female ports and tighten with a spanner on the hex flats; AirTAC publishes no torque value for this family, so tighten to a sound seal and do not over-stress the female casting. On the hot lines this part is meant for, check the re-tightening interval after the first heat cycle, because differential expansion between steel and the mating casting can relax a first-fit joint slightly.
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