Airtac BB Double Male Thread Straight Connector BB0204-S
SUS304 stainless variant (-S)The AirTAC Airtac BB Double Male Thread Straight Connector BB0204-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 BB0204-S
The BB0204-S is a straight stainless-steel male connector that steps a pneumatic line up from a 1/4in PT male thread to a 1/2in PT male thread. Both ends are external threads, so it screws into two ports of different sizes and turns a size mismatch between a valve, manifold or cylinder port into a simple screwed joint. The -S suffix means the whole body is SUS304 stainless steel, not plated brass, so nothing plating-thickness related changes how it survives a wash-down or a hot enclosure.
This family exists for the spots a one-touch resin fitting has to leave: a proof pressure of 3.0 MPa against the usual 1.5 MPa, and a service temperature of 0 to 150 C against their roughly 70 C ceiling. Working pressure is 0-1.0 MPa and vacuum down to -750 mmHg is also handled. AirTAC rates the stainless and standard versions identically, so the -S buys you corrosion resistance and copper-free construction, never a higher number.
Airtac BB Double Male Thread Straight Connector BB0204-S Technical Specifications
| Model | Airtac BB Double Male Thread Straight Connector BB0204-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 BB0204-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 BB0204-S Is Used
Wash-down packaging line plumbing
Steps a 1/4in pilot or solenoid line up to a 1/2in header on packaging machinery washed down daily, where plated brass weeps at the thread within months and SUS304 does not.
PET blow-moulder hot zone
Carries actuator air in the hot zone of a PET blow-moulding tool, where oven-back radiant heat pushes line temperatures past the 70 C limit of one-touch resin fittings.
Plating and electronics process air
Copper-free SUS304 construction suits plating-line pneumatic circuits and electronics process air, where dissolved copper from brass fittings contaminates the bath or the wafer environment.
Is the Airtac BB Double Male Thread Straight Connector BB0204-S the Right Part?
Sizing runs in single thread steps. One step down on the small end is BB0203 (1/4in to 3/8in) when your large port is only a 3/8in; one step up is BB0304 (3/8in to 1/2in) if the small port is actually a 3/8in. If both ports are 1/2in, use the straight BB0404 instead, and if you need a female side on the big port, BD0204 does the same step with a female Thread I. This 0204 pairing is a genuine step-up joint, so check which of your two ports is larger before ordering.
Choose this part over a BB0204 plus a bushing when you want one solid stainless piece in the line - fewer joints to seal, fewer places to leak, and no plated adapter to corrode next to the stainless. For an unused 1/2in port on the same panel, a BZ04 plug is the honest answer rather than a connector blanked off with tape.
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 BB0204-S FAQ
It is a SUS304 stainless male connector with a 1/4in PT male thread on one side and a 1/2in PT male thread on the other, no tube involved. 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 service temperature range is 0 to 150 C. The stainless -S version carries exactly the same ratings as the standard nickel-plated BB0204; only the material changes.
Both ends are PT taper threads, so seal the male thread with 2 to 3 wraps of PTFE tape wound in the direction of rotation before screwing it into each port. AirTAC does not publish a tightening torque for these fittings, so snug the joint down and avoid heavy wrench force that could stress the port. Assemble the 1/2in end first, since its larger spanner flats are easier to hold while the 1/4in side is made up.
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