This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI100X280S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI100X280S 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-SI100X280S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X280S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI100X280S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI100X280S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X280S
The AirTAC B04-SI100X280S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the SI100X280S, mechanically identical to the base model with a 100mm bore, 280mm stroke, G1/2 port, and 3927 N push force at 0.5 MPa. AirTAC replaced this legacy line with the SAI100X280S, a true drop-in upgrade sharing the same ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI100X280S features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For this bore class, the safe working load is roughly 2356 N (about 60% of the 3927 N push force), yielding a vertical lift capacity of approximately 200 kg with a 2:1 margin. The SAI family also introduces variants the SI line lacked, such as the SAIL air-released lock and BSAI clamp-lock, while retaining the CS1-B/DS1-B legacy sensor compatibility of this -S magnet-equipped model.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X280S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X280S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI100X280S |
| Bore size | Ø100 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| 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-SAI100X280S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
The B04-SAI100X280S 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-SI100X280S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×280 | 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-SI100X280S Is Used
Excavator Actuation
Drives secondary auxiliary mechanisms on heavy excavation equipment where the B04- construction prefix indicates dedicated heavy-duty deployment.
Concrete Pump Gates
Handles the 3927 N force required to shift heavy flow-control valves and discharge gates on concrete pumping machinery.
Crane Load Controls
Actuates locking pins and outrigger positioning arms on mobile cranes, utilizing the 280mm stroke for extended reach.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X280S with the B04-SAI100X280S
To replace the B04-SI100X280S, order the SAI100X280S. It drops directly into existing fixtures via the identical ISO 15552 mounting interface, matching the 100mm bore, 280mm stroke, G1/2 port, and M20x1.5 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and the -S magnet requirement for CS1-B/DS1-B switches. When sizing, note that a 100mm bore yields 3927 N push at 0.5 MPa; if you need less force, step down to an 80mm bore (2513 N), or step up to 125mm (6136 N) for heavier construction-machinery loads. Because 280mm exceeds 300mm? No, but for strokes over 200mm, verify guide alignment to prevent rod bending. A plain cylinder does not hold load without live air; the cushion only decelerates. For load holding on air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI100X280S
- ✓ 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-SI100X280S FAQ
Yes, the B04-SI100X280S is discontinued. The exact drop-in replacement is the SAI100X280S. It shares the exact same ISO 15552 mounting interface, 100mm bore, 280mm stroke, output force, G1/2 port, and mounting accessories. The B04- prefix simply marked it as the construction-machinery dedicated variant, and the SAI replacement matches all its physical specs.
The 100mm bore operates at 0.15-1.0 MPa with a G1/2 port. Force output is 3927 N push and 3681 N pull at 0.5 MPa, 5497 N push at 0.7 MPa, 7068 N push at 0.9 MPa, and a theoretical max of 801 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
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