This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI100X250S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI100X250S 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-SI100X250S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI100X250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI100X250S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X250S
The AirTAC B04-SI100X250S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the SI100X250S, mechanically identical to the base model with a 100mm bore, 250mm stroke, and 3927N push force at 0.5MPa. AirTAC replaced this EOL unit with the SAI100X250S, a true drop-in replacement sharing the same ISO 15552 mounting interface, G1/2 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 extended life. For your sizing, the safe working load is roughly 2356N (60% of the 0.5MPa push force), translating to a 200kg vertical lift with a 2:1 margin. The original SI uses CS1-B/DS1-B sensors, while the SAI family introduces lock and valve variants like SAIL and BSAI that the SI lacked.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X250S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI100X250S |
| Bore size | Ø100 mm |
| Stroke | 250 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-SAI100X250S 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-SAI100X250S 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-SI100X250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×250 | 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-SI100X250S Is Used
Excavator Actuation
Drives auxiliary mechanisms on heavy equipment where the B04- prefix indicates construction-machinery dedication, utilizing the 3927N push force for robust positioning.
Heavy Fixture Clamping
Secures large structural components during machining or welding, relying on the 100mm bore's 3681N pull force at 0.5MPa to maintain rigid workholding.
Material Handling Gates
Operates large diverter gates or heavy doors on aggregate and cement processing lines, benefiting from the adjustable 36mm air cushions at both ends.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X250S with the B04-SAI100X250S
To replace the B04-SI100X250S, order the SAI100X250S. It is dimensionally interchangeable per ISO 15552, retaining the exact 100mm bore, 250mm stroke, G1/2 port, and mounting accessories. Confirm your port thread (PT/G/NPT) and keep the -S magnet for CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For loads needing holding on air loss, note that plain cylinders drift; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 250mm stroke, side-load risks are moderate, but always guide the load to prevent rod bending. If sizing up or down, neighboring bores (80mm, 125mm) offer different forces (2513N, 6136N at 0.5MPa).
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI100X250S
- ✓ 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-SI100X250S FAQ
Yes, the B04-SI100X250S is discontinued. The exact drop-in replacement is the SAI100X250S. It is dimensionally interchangeable per ISO 15552, offering the same bore, stroke, force, G1/2 port, and mounting interface. The B04- prefix simply marked it as construction-machinery dedicated; the SAI replacement matches all physical specs.
The 100mm bore features a G1/2 air port and M20x1.5 rod thread. Force output is 3927N push and 3681N pull at 0.5MPa, 5497N push at 0.7MPa, 7068N push at 0.9MPa, and a theoretical max of 801kgf at 1.0MPa. It operates at 30-800mm/s with adjustable cushions.
Related AirTAC SAI Cylinders
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