This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X900, 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-SID50X900
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X900, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X900
- 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-SID50X900
The AirTAC B04-SID50X900 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates the construction-machinery dedicated variant of the base SID50X900, 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 at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This model is discontinued and end-of-life; the direct replacement is the SAID50X900, sharing the same 50 mm bore, 900 mm stroke, G1/4 port, M16x1.5 rod thread, and 30 mm adjustable cushion at each end.
The double-rod design provides anti-rotation stability and allows the back rod to carry a sensor cam or drive two tools simultaneously, while the genuine ISO 15552 mounting interface lets you reuse existing FA, LB, or TC brackets. The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet (no -S suffix) and cannot take a magnetic switch.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X900 |
| Bore size | Ø50 mm |
| Stroke | 900 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-SAID50X900 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-SAID50X900 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-SID50X900
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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-SID50X900 Is Used
Excavator Linkage Actuation
Drives synchronized heavy-equipment covers or gates on construction machinery where equal push and pull force prevents linkage binding during bidirectional cycles.
Concrete Pump Positioning
Moves diverter chutes on concrete pumps; the double-rod geometry provides anti-rotation stability and the rear rod simultaneously operates a mechanical indicator.
Crane Boom Extension Stops
Acts as a bidirectional stop or centering device in heavy-equipment boom mechanisms, using both rod ends to manage equal forces in extension and retraction.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900 with the B04-SAID50X900
To replace the discontinued B04-SID50X900, swap in the SAID50X900 direct: it preserves the 50 mm bore, 900 mm stroke, G1/4 port, and ISO 15552 mounting interface, so your FA, LB, or TC brackets bolt straight on. Because force is equal both ways, size the replacement by matching the 825 N @0.5 MPa output; if you need more lift, step up to the 63 mm bore (1402 N @0.5 MPa) rather than assuming a larger single-rod push. Choose a double-rod cylinder when you need anti-rotation stability, want the back rod to drive a second tool, or need to mount a sensor cam on the rear. This non-magnetic SKU cannot take a switch; add the -S suffix on the SAID if you need sensing. With a 900 mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder does not hold loads on air loss—the cushion only decelerates near stroke end—so for held loads use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X900
- ✓ 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-SID50X900 FAQ
Yes, the B04-SID50X900 (construction-machinery dedicated SID50X900) is discontinued. The direct replacement is the SAID50X900, which shares the same 50 mm bore, 900 mm stroke, G1/4 port, and ISO 15552 mounting interface. The B04- prefix is an application designation only and does not change the physical specs.
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, and it features a 20 mm rod with M16x1.5 thread. The SAI replacement adds an upgraded Y-shaped piston seal for longer life.
Related AirTAC SAI Cylinders
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