This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI80X800S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI80X800S 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-SI80X800S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 800mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI80X800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke800 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI80X800S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X800S
The AirTAC B04-SI80X800S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as a construction-machinery dedicated variant of the SI80X800S, mechanically identical to the base model with an 80mm bore and 800mm stroke. Delivering 2513 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI80X800S.
The SAI80X800S is a true drop-in upgrade sharing the exact ISO 15552 mounting interface, bore, and stroke. It features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. For this bore, safe working load is roughly 1508 N, allowing a vertical lift of about 128 kg with a 2:1 margin. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X800S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI80X800S |
| Bore size | Ø80 mm |
| Stroke | 800 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-SAI80X800S 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-SAI80X800S 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-SI80X800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×800 | 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-SI80X800S Is Used
Excavator Actuation
Drives secondary heavy-equipment mechanisms on construction machinery where the 80mm bore and 800mm stroke provide extended reach and 2513 N thrust at 0.5 MPa.
Heavy Fixture Clamping
Secures large structural components during fabrication, utilizing the 1508 N safe working load to hold workpieces firmly in demanding industrial environments.
Material Transfer Gates
Actuates long-throw sorting doors or heavy material diversion gates on aggregate or construction-material conveyors, requiring the full 800mm travel.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X800S with the B04-SAI80X800S
To replace the B04-SI80X800S, order the SAI80X800S. Confirm the ISO 15552 mounting interface, 80mm bore, 800mm stroke, G3/8 port, and the -S magnet for position sensing. The original used legacy CS1-B/DS1-B switches, while the SAI uses current AirTAC switches. If you need more force, the 100mm bore offers 3927 N push at 0.5 MPa; if less is needed, the 63mm bore provides 1559 N. 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. At 800mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI80X800S
- ✓ 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-SI80X800S FAQ
Yes, the B04-SI80X800S is discontinued. The exact drop-in replacement is the SAI80X800S. It shares the same ISO 15552 mounting interface, 80mm bore, 800mm stroke, output force, and G3/8 port. The B04- prefix simply designates the construction-machinery variant, and the SAI upgrade is dimensionally interchangeable per ISO 15552.
The 80mm bore with a 25mm rod and M20x1.5 thread delivers 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 max of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s. It includes a 36mm adjustable air cushion at each end and uses a G3/8 port.
Related AirTAC SAI Cylinders
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