Airtac SAID40 Double Rod Cylinder SAID40BX125
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX125 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40BX125
The AirTAC SAID40X125 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40 mm bore and 125 mm stroke. Because a rod exits both end covers, the annulus area is identical on extend and retract, yielding equal force and speed in both directions—delivering 528 N at 0.5 MPa and 739 N at 0.7 MPa each way. The piston rod is SUS304 stainless steel (code B), offering superior corrosion resistance for wet or chemically exposed environments.
This through-rod design lets you mount the primary workpiece on one end and a cam, position flag, or secondary tool on the rear end. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. It features adjustable air cushions at both ends (30 mm cushion stroke) to decelerate the piston near stroke end, operating at speeds from 30-800 mm/s.
Airtac SAID40 Double Rod Cylinder SAID40BX125 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX125 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 SAID40BX125
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SAID40BX125 Is Used
Twin-Station Actuation
Drive two separate workstations simultaneously from one cylinder, using both rod ends to push and pull independent mechanisms with perfectly synchronized motion.
Anti-Rotation Slides
The twin-rod configuration inherently resists piston rotation, keeping guided slides and lifting forks perfectly aligned without needing external linear bearings.
Through-Rod Sensing
Mount a position flag or cam on the rear rod end to trigger external sensors, allowing precise end-of-stroke confirmation for automated clamping and press tasks.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX125 the Right Cylinder?
Choose this double-rod SAID40X125 over a single-rod SAI when your mechanism requires anti-rotation guidance, dual-side actuation, or rear-position sensing. If you need less force, stepping down to the 32 mm bore drops the both-way output to 345 N at 0.5 MPa; stepping up to the 50 mm bore raises it to 825 N. Ensure your layout accommodates the extra rear-rod protrusion clearance.
This cylinder uses a PT tapered G1/4 port and supports mounting accessories Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). It is dimensionally interchangeable per ISO 15552. Note that a plain SAID does not hold its position or load when air is exhausted or the valve is centered—the piston drifts. For dead-air load holding, consider an AirTAC SAIL lock, BSAID clamp-lock, or an external rod lock. Because the stroke is 125 mm, side-load and rod-bearing bending are minimal, but long unsupported strokes still require an external guide.
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 SAID40BX125 FAQ
Because the double-rod design subtracts the rod area from both sides, the extend and retract forces are equal. It provides 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa in both directions.
Yes, the SAID40X125 is dimensionally interchangeable with other ISO 15552 double-rod profile cylinders. It uses the standard ISO mounting footprint and PT G1/4 ports, making it a drop-in replacement.
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