Airtac SAID40 Double Rod Cylinder SAID40X550
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40X550 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40X550
The AirTAC SAID40X550 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm bore and 550mm stroke. Because a carbon steel rod extends from both end covers, the annulus area is identical on extend and retract, yielding an equal 528N of force in both directions at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
A defining advantage of this twin-rod layout is the ability to mount a workpiece on the front end while utilizing the rear rod end for a secondary cam, position flag, or pilot mechanism. This dual-sided guidance inherently resists torsional rotation better than a single-rod actuator. It uses a PT G1/4 port and adjustable air cushions at both ends to decelerate the payload smoothly.
Airtac SAID40 Double Rod Cylinder SAID40X550 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40X550 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAID40 Double Rod Cylinder SAID40X550
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAID40 Double Rod Cylinder SAID40X550 Is Used
Symmetric Force Transfer
Ideal for moving payloads where the push and pull forces must be exactly matched, preventing speed variations between extend and retract cycles.
Anti-Rotation Slides
The twin-rod architecture prevents the piston from twisting, providing precise linear guidance for tools that cannot tolerate rotational play.
Rear-End Sensing
The protruding rear rod offers a dedicated mounting point for a position flag or cam, keeping the primary work area clear for the main payload.
Is the Airtac SAID40 Double Rod Cylinder SAID40X550 the Right Cylinder?
Choose this 40mm bore when an application requires 528N of symmetric push and pull force, or step up to the 50mm bore for 825N if moving heavier loads. The double-rod design is selected over a single-rod SAI when twin-station actuation, anti-rotation guidance, or rear-rod position sensing is required. Mounting accessories follow the ISO 15552 interface using the SAID subset (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB, CA, CB, and CR.
At a 550mm stroke, the unsupported rod length increases bending moments and side-load risks on the rod bearing; utilizing an external guide rail is highly recommended. Note that the air cushion only decelerates the piston near stroke end and does not hold the load. If position holding is required upon air loss, consider an external rod lock or the BSAID clamp-lock variant.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAID40 Double Rod Cylinder SAID40X550 FAQ
The double-rod design provides equal force in both directions. It delivers 528N at 0.5 MPa, 739N at 0.7 MPa, and 950N at 0.9 MPa for both extend and retract strokes.
Yes, the SAID40X550 is dimensionally interchangeable per ISO 15552 mounting dimensions. You can use it as a direct replacement for other standard ISO 15552 double-rod profile cylinders.
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