This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X25, 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-SID50X25
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X25
- 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-SID50X25
The AirTAC B04-SID50X25 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SID50X25, mechanically identical in every spec. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal both ways (825 N @0.5 MPa). The bore is 50 mm, the port is G1/4, and the rod-end thread is M16x1.5. This SKU has no -S magnet and cannot take a magnetic switch.
This SID model is discontinued and end-of-life. The direct replacement is the SAID50X25, which shares the same ISO 15552 interface, bore, stroke, force, port, and mounting. The SAI replacement uses an upgraded piston seal (two Y-shaped one-way elements for long life and low start-up pressure) and adds SAIL/BSAI lock variants. Note that air cushions only decelerate near stroke end; for held loads use an external rod lock.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X25 |
| Bore size | Ø50 mm |
| Stroke | 25 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID50X25 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The B04-SAID50X25 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-SID50X25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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-SID50X25 Is Used
Excavator Linkage Actuation
Provides equal push and pull force for moving heavy-equipment covers and access panels on construction machinery, preventing asymmetric binding.
Crusher Tool Drive
Drives two opposing tools simultaneously from one piston, ensuring perfectly synchronized cutting or crushing action in heavy-duty material processing.
Guided Lifting Frame
The dual-rod architecture resists torsional side loads and prevents rotation when lifting heavy structural components or machinery frames.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25 with the B04-SAID50X25
To replace the B04-SID50X25, swap it directly with the SAID50X25, reusing the existing ISO 15552 FA, LB, or TC mounting hardware and G1/4 port. Because force is equal both ways (825 N @0.5, 1154 N @0.7, 1484 N @0.9 MPa), size both directions identically; if higher force is needed, step up to the 63 mm bore (1402 N @0.5). A double-rod design is right when you need anti-rotation stability, the ability to drive two tools, or a back rod to carry a sensor cam. This non-magnetic SKU cannot use sensors. For stroke lengths >=300 mm, verify side-load limits to prevent guide wear. A plain cylinder does not hold loads on air loss; for held loads, specify the SAIL or BSAI lock variant, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X25
- ✓ 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-SID50X25 FAQ
Yes, the B04-SID50X25 is discontinued. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID50X25. The direct replacement is the SAID50X25, which shares the same ISO 15552 interface, 50 mm bore, 25 mm stroke, G1/4 port, and mounting. The SAI family also adds SAIL and BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X25
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