This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI80X305S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI80X305S 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-SI80X305S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X305S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 305mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI80X305S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke305 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI80X305S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X305S
The AirTAC B04-SI80X305S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks this as a construction-machinery dedicated variant of the SI80X305S, mechanically identical to the base model with an 80mm bore, 305mm stroke, and 2513 N push force at 0.5 MPa. AirTAC replaced the SI line with the SAI80X305S, a true drop-in sharing the same ISO 15552 mounting interface, G3/8 port, and M20x1.5 rod thread.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For your sizing, the safe working load is roughly 1508 N (about 60% of the 0.5 MPa push force), yielding a 128 kg vertical lift with a 2:1 margin. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family introduces SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X305S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X305S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI80X305S |
| Bore size | Ø80 mm |
| Stroke | 305 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-SAI80X305S 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-SAI80X305S 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-SI80X305S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×305 | 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-SI80X305S Is Used
Excavator Actuation
Drives auxiliary mechanisms on heavy equipment where the B04- prefix indicates construction-machinery dedication, leveraging 2513 N of thrust at 0.5 MPa.
Heavy Fixture Clamping
Secures large structural components during machining, utilizing the 305mm stroke to accommodate varying material widths safely.
Material Pressing
Applies steady downward pressure in assembly lines, taking advantage of the 36mm adjustable air cushions to decelerate the load at stroke end.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X305S with the B04-SAI80X305S
To replace the B04-SI80X305S, order the SAI80X305S. Verify your ISO 15552 mounting interface, 305mm stroke, G3/8 port, and -S magnet for CS1-B/DS1-B switches. Because this is a 305mm stroke, use external guides to prevent rod bending and side-load wear. If you need more force, the neighboring 100mm bore offers 3927 N push at 0.5 MPa; if less is needed, the 63mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI80X305S
- ✓ 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-SI80X305S FAQ
Yes, the B04-SI80X305S is discontinued. The exact drop-in replacement is the SAI80X305S. It is dimensionally interchangeable per ISO 15552, keeping the same 80mm bore, 305mm stroke, output force, G3/8 port, and mounting accessories.
This 80mm bore cylinder has a G3/8 air port and M20x1.5 rod thread. It 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 force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
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