Airtac SAID40 Double Rod Cylinder SAID40BX425S
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX425S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40BX425S
The AirTAC SAID40X425-S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 425mm stroke. Because the piston rod extends from both end covers, the effective annulus area is identical on both sides. This means extend and retract forces are perfectly equal, providing 528N of thrust and pull simultaneously at 0.5 MPa.
Equipped with a magnetic piston (-S), this variant is ready for position sensing using AirTAC CMSE reed or DMSE electronic switches along the dual sensor grooves. It uses a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threading. The rear rod end can drive a secondary mechanism or mount a limit flag, while the twin-rod design inherently resists torsional rotation.
Airtac SAID40 Double Rod Cylinder SAID40BX425S Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX425S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 425 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 SAID40BX425S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×425 | 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 SAID40BX425S Is Used
Symmetric Transfer
Drives a transfer carriage with identical 528N force and speed extending and retracting, ensuring perfectly balanced cycle times on a conveyor line.
Anti-Rotation Slides
The twin SUS304 rods guide the payload against torsional deflection, keeping precision sliding mechanisms aligned without external guide rails.
Rear-End Sensing
Mounts a mechanical cam or position flag on the rear rod end to trigger external DMSE solid-state sensors, isolating sensitive electronics from the primary work area.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX425S the Right Cylinder?
Choose this 40mm bore when an application demands equal 528N force in both directions at 0.5 MPa, stepping up from a 32mm bore (345N) for higher capacity, or down from a 50mm bore (825N) to save space. A double-rod configuration is preferred over a single-rod SAI when you need dual-side guidance, anti-rotation stability, or rear-end sensing. Remember that the adjustable air cushions only decelerate the piston near stroke end; they do not hold the load. If air pressure drops, the cylinder will drift. For dead-end holding, use an external pilot-operated check valve or explore the BSAID clamp-lock series.
With a 425mm stroke, the unsupported rod length increases the risk of side-load bending. Use an external guide rail to support the workpiece and prevent excessive wear on the rod bearing. This cylinder is dimensionally interchangeable per ISO 15552, offering a drop-in replacement for other ISO 15552 double-rod cylinders. Specify the 40mm bore, 425mm stroke, PT port, and mounting accessories from the SAID set: Basic, FA, LB, TC, FTC, TCM1, or TCM2 (FB, CA, CB, and CR are single-rod SAI only).
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 SAID40BX425S FAQ
Because the rod occupies both sides of the piston, the effective area is equal in both directions. The output force is 528N at 0.5 MPa, 739N at 0.7 MPa, and 950N at 0.9 MPa for both extension and retraction.
Yes, the SAID40X425-S is a profile-type cylinder built to ISO 15552 mounting interface dimensions, making it dimensionally interchangeable with other ISO 15552 double-rod cylinders. It uses a PT G1/4 port and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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