This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI100X300S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI100X300S 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-SI100X300S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø100mm bore and 300mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI100X300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ100 mm
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI100X300S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X300S
The AirTAC B04-SI100X300S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the SI100X300S, though mechanically identical to the base model. It delivers 3927 N push and 3681 N pull at 0.5 MPa, using a G1/2 port and M20x1.5 rod thread.
You must order the drop-in SAI100X300S replacement. It shares the exact ISO 15552 mounting interface, 300 mm stroke, and force ratings. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. For your sizing, the safe working load is roughly 2356 N (60% of the 0.5 MPa push), equating to a 200 kg vertical lift with a 2:1 margin.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X300S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI100X300S |
| Bore size | Ø100 mm |
| Stroke | 300 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-SAI100X300S 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-SAI100X300S 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-SI100X300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 100 | Bore size in mm. |
| ×300 | 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-SI100X300S Is Used
Excavator Actuation
Drives heavy auxiliary mechanisms on earthmoving equipment where the construction-machinery dedicated B04- prefix is specified for robust deployment.
Heavy Press Ejection
Provides the 3927 N push force at 0.5 MPa needed to eject dense formed parts from industrial presses, utilizing the 300 mm stroke length.
Loader Gate Control
Actuates heavy positioning gates and bulk material chutes on construction sites, benefiting from the rugged ISO 15552 profile barrel.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI100X300S with the B04-SAI100X300S
To replace this B04-SI100X300S, order the SAI100X300S. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the -S magnet for CS1-B/DS1-B legacy sensors (the SAI uses current AirTAC switches). If you need to size down, the 80 mm bore yields 2513 N push at 0.5 MPa; sizing up to 125 mm provides 6136 N. For load holding, a plain cylinder drifts without live air—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 300 mm stroke, prevent rod bending by using an external guide to handle side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI100X300S
- ✓ 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-SI100X300S FAQ
Yes, the B04-SI100X300S is discontinued. The exact drop-in replacement is the SAI100X300S. It features the same ISO 15552 mounting interface, 100 mm bore, 300 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly. The B04- prefix simply marked it as the construction-machinery dedicated variant of the base SI100X300S.
This double-acting cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed of 30-800 mm/s. Forces are: 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. It has a 25 mm rod, M20x1.5 thread, and 36 mm adjustable cushions. The SAI upgrade adds a two Y-shaped one-way piston seal for low start-up pressure.
Related AirTAC SAI Cylinders
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