This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X25S, with the same bore, stroke, output force, port and mounting, so it fits the same application. 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-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X25S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X25S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S
The AirTAC B04-SID40X25S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force are equal. The B04- prefix designates this as a construction-machinery dedicated variant, mechanically identical to the standard SID40X25S. This model is discontinued; the direct replacement is the SAID40X25S, reusing the exact same ISO 15552 mounting interface, 40mm bore, 25mm stroke, G1/4 port, and M12x1.25 rod thread. The SAI family upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Because both faces use the rod-side area, force is equal both ways: 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. The dual-rod design prevents piston rotation and allows driving two tools simultaneously. Note that the air cushion only decelerates the load near stroke end; it will not hold a load on air loss without an external rod lock.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X25S |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID40X25S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The B04-SAID40X25S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S Is Used
Excavator Linkage Control
Uses the equal both-ways force and anti-rotation properties of the dual rods to actuate secondary heavy-equipment covers or locks reliably in harsh construction environments.
Synchronized Tool Drive
Drives two opposing clamps or forming tools simultaneously from a single 40mm bore piston, ensuring perfectly mirrored motion for compact assembly fixtures.
Loader Attachment Brake
Provides stable, equal push and pull force on heavy-equipment attachment pins, where the G1/4 port and robust M12x1.25 rod thread handle high-cycle actuation.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S with the B04-SAID40X25S
To replace the discontinued B04-SID40X25S, specify the SAID40X25S, which preserves the 25mm stroke, 40mm bore, G1/4 port, and ISO 15552 mounting dimensions for a direct. When sizing, verify the equal both-ways force fits your load: if 528N at 0.5MPa is insufficient, step up to the 50mm bore (825N), or step down to the 32mm bore (345N) if lower force is acceptable. A double-rod cylinder is the right choice when you need anti-rotation stability or must drive two mechanisms from one piston. Mounting options include Basic, FA, LB, and TC styles. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Because the stroke is under 300mm, side-load concerns are minimal, but never rely on the cylinder to hold a load without live air.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X25S
- ✓ 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-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25S FAQ
Yes, the B04-SID40X25S is discontinued. The direct replacement is the SAID40X25S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID40X25S. The SAID replacement shares the exact same 40mm bore, 25mm stroke, G1/4 port, and ISO 15552 mounting interface, but adds an upgraded Y-shaped piston seal for longer life.
Because it is a double-rod cylinder, the push and pull force are equal both ways: 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. The air port size is G1/4. Remember that the adjustable 27mm air cushion only decelerates the load near stroke end; it does not hold the load on air loss, so an external rod lock is required for held loads.
Related AirTAC SAI Cylinders
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