This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X450S, 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-SID50X450S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X450S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X450S
- 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-SID50X450S
The AirTAC B04-SID50X450S is a discontinued double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X450S, mechanically identical to it. 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). It features a 50mm bore, G1/4 port, M16x1.5 rod thread, and a 450mm stroke. The direct replacement is the SAID50X450S, sharing the same interface, force, and mounting.
The SAID replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The rear rod can carry a sensor cam or drive two tools simultaneously. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder does not hold loads on air loss; the air cushion only decelerates near stroke end.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X450S |
| Bore size | Ø50 mm |
| Stroke | 450 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-SAID50X450S 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-SAID50X450S 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-SID50X450S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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-SID50X450S Is Used
Excavator Linkage Control
Equal both-ways force drives dual tooling on heavy-equipment arms, utilizing the back rod for a sensor cam while maintaining precise anti-rotation in harsh construction environments.
Paver Synchronized Gating
Double-rod geometry ensures equal push and pull forces for paving machine gates, while the 450mm stroke requires external guides to handle side-load and prevent rod bending.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450S with the B04-SAID50X450S
To replace the discontinued B04-SID50X450S, use the SAID50X450S direct: same 50mm bore, 450mm stroke, G1/4 port, and ISO 15552 mounting interface (Basic, FA, LB, TC). Size both ways by checking neighbour bores while verifying the equal both-ways force meets your needs. A double rod is right when you need anti-rotation, a back rod to carry a sensor cam, or to drive two tools. The -S magnet enables position sensing. For the 450mm stroke, use external guides to prevent rod bending and side-load damage. For load holding on air loss, use an external rod lock or pilot-operated check valve, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X450S
- ✓ 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-SID50X450S FAQ
Yes, the B04-SID50X450S is discontinued. The B04- prefix marks it as the construction-machinery dedicated variant of the SID50X450S. The direct replacement is the SAID50X450S, which shares the same ISO 15552 mounting interface, 50mm bore, 450mm stroke, G1/4 port, and equal both-ways force.
Force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore is 50mm with a G1/4 air port, M16x1.5 rod thread, and 30mm adjustable cushion at each end. Speed is 30-800 mm/s. The air cushion only decelerates near stroke end and does not hold loads on air loss.
Related AirTAC SAI Cylinders
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