This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X450, 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-SID50X450
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450 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-SAID50X450, 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-SAID50X450
- 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-SID50X450
The AirTAC B04-SID50X450 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X450, sharing identical specifications. Because a rod exits both ends, the push and pull force is equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore is 50 mm with a G1/4 air port, M16x1.5 rod thread, and 30 mm adjustable cushions. This model is discontinued and the direct replacement is the SAID50X450, which retains the same interface, force, and mounting.
The double-rod design prevents rotation and allows the back rod to drive a second tool, while the SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a -S magnet and cannot take a sensor. Note that air cushions only decelerate near stroke end; they do not hold loads on air loss, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X450 |
| 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-SAID50X450 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-SAID50X450 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-SID50X450
| 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-SID50X450 Is Used
Excavator Linkage
Equal both ways force drives dual actuation arms on heavy equipment without the rotational play of a single rod.
Loader Tool Shift
The rear rod extension simultaneously operates a secondary valve or gauge panel on construction machinery.
Crusher Gate Control
Anti-rotation stability from the double rod keeps heavy material chute gates aligned during abrasive operations.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X450 with the B04-SAID50X450
To replace the discontinued B04-SID50X450, use the SAID50X450, which is a direct match for the ISO 15552 mounting interface, 50 mm bore, 450 mm stroke, and G1/4 port. When sizing both ways, verify the equal force of 825 N @0.5 MPa is sufficient, or step to neighboring bores like the 63 mm (1402 N) or down to the 40 mm (528 N). A double rod is right when you need anti-rotation stability or want to drive two tools from one piston. Reuse FA, LB, or TC mounts. For the 450 mm stroke, add external guides to prevent rod bending under side loads. Because this SKU has no -S magnet, it cannot support sensing.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X450
- ✓ 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-SID50X450 FAQ
Yes, the B04-SID50X450 is discontinued. The direct replacement is the SAID50X450. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID50X450, so the SAID50X450 matches its 50 mm bore, 450 mm stroke, G1/4 port, and ISO 15552 mounting exactly.
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.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X450
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