This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI80X320S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI80X320S in place of this model. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 320mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI80X320S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke320 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI80X320S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S
The AirTAC B04-SI80X320S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the SI80X320S, mechanically identical to the base model with an 80mm bore, 320mm stroke, G3/8 port, and 2513 N push force at 0.5 MPa. AirTAC replaced this EOL unit with the SAI80X320S, a true drop-in sharing the same interface, bore, stroke, force, port and mounting.
The SAI80X320S upgrade features a revised piston seal (two Y-shaped one-way elements) for low start-up pressure and long life. For this bore class, a safe working load is roughly 1508 N (about 60% of the 0.5 MPa figure), yielding a 128 kg vertical lift with a 2:1 margin. The SAI family also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S suffix means a piston magnet for CS1-B/DS1-B switches; the SAI uses current AirTAC switches.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI80X320S |
| Bore size | Ø80 mm |
| Stroke | 320 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAI80X320S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The B04-SAI80X320S produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×320 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S Is Used
Excavator Actuation
Drives secondary heavy-equipment functions on construction machinery where the 2513 N thrust and 320mm travel handle robust positioning tasks.
Aggregate Transfer
Pushes material handling gates or diverter arms in harsh quarry and site environments, utilizing the 128 kg vertical lift capacity.
Fixture Clamping
Secures large structural components during welding or assembly, relying on the 513 kgf maximum force and ISO 15552 mounting rigidity.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S with the B04-SAI80X320S
To replace the B04-SI80X320S, order the SAI80X320S. Confirm the ISO 15552 mounting interface, 80mm bore, 320mm stroke, G3/8 port (PT/G/NPT thread options), and mounting accessory. The -S magnet carries over. If sizing both ways, neighboring bores are 63mm (1559 N push @0.5 MPa) and 100mm (3927 N push @0.5 MPa). A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 320mm stroke exceeds 300mm, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI80X320S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X320S FAQ
Yes, the B04-SI80X320S is discontinued. The exact drop-in replacement is the SAI80X320S. It is dimensionally interchangeable per ISO 15552, keeping the same 80mm bore, 320mm stroke, G3/8 port, force, and mounting interface. The B04- prefix only denotes the construction-machinery dedicated variant; mechanically it is identical to the base SI80X320S.
The 80mm bore uses a G3/8 air port and features a 25mm rod with an M20x1.5 thread. Force output is 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical maximum of 513 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
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