This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X25S, 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-SID50X25S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25S 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-SAID50X25S, 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-SAID50X25S
- 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-SID50X25S
The AirTAC B04-SID50X25S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding exactly equal push and pull forces (825 N at 0.5 MPa). The B04- prefix marks this as AirTAC's construction-machinery dedicated variant, mechanically identical to the base SID50X25S. It features a 50 mm bore, G1/4 port, M16x1.5 rod thread, and 30 mm adjustable cushions. This SID model is discontinued; the direct replacement is the SAID50X25S, sharing the same interface and force.
The SAID upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; for load holding on air loss, an external rod lock or SAIL/BSAI variant is required.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X25S |
| 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-SAID50X25S 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-SAID50X25S 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-SID50X25S
| 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-SID50X25S Is Used
Excavator Linkage Control
Drives dual-action pilot linkages on heavy equipment where equal push/pull force prevents asymmetric drift during hydraulic bypass operations.
Loader Attachment Shift
Synchronizes side-shift mechanisms on construction loaders, using the back rod to carry a sensor cam for precise fork positioning.
Crane Boom Sequencing
Actuates secondary boom extensions with equal both-ways force, ensuring smooth extension and retraction under varying loads.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X25S with the B04-SAID50X25S
To replace the discontinued B04-SID50X25S, specify the SAID50X25S, which preserves the 50 mm bore, 25 mm stroke, G1/4 port, and ISO 15552 mounting footprint. Because the double-rod design provides equal force both ways, verify your load against the 825 N rating at 0.5 MPa; if higher force is needed, step up to the 63 mm bore (1402 N), or drop to the 40 mm bore (528 N) for lighter duties. Choose a double-rod cylinder when you need anti-rotation stability, a back rod to carry a sensor cam, or to drive two tools simultaneously. Reuse existing FA, LB, or TC mounts. The -S magnet enables position sensing. For this 25 mm stroke, side-load bending moments are minimal, but any stroke over 300 mm requires careful guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X25S
- ✓ 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-SID50X25S FAQ
Yes, the B04-SID50X25S is discontinued. The direct replacement is the SAID50X25S. The B04- prefix only denotes the construction-machinery dedicated variant; mechanically, it is identical to the base SID50X25S. The SAID replacement shares the same ISO 15552 interface, 50 mm bore, 25 mm stroke, G1/4 port, and mounting, but adds an upgraded piston seal.
As a double-rod cylinder, the push and pull forces are equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The air port size is G1/4.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X25S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X25S replacement — usually within 7-8 hours.