Airtac SAID40 Double Rod Cylinder SAID40X250S
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40X250S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40X250S
The AirTAC SAID40X250-S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm bore and 250mm stroke. Because a carbon steel rod exits both end covers, the effective annulus area is identical in both directions, yielding exactly 528N of force at 0.5 MPa on both extend and retract strokes. The integrated -S magnet enables position detection using AirTAC CMSE reed or DMSE solid-state sensors housed in the dual-side barrel grooves.
This through-rod architecture allows mounting a primary workpiece on the front rod end while attaching a secondary cam, position flag, or synchronizing mechanism to the rear rod. It provides superior anti-rotation guidance for loads compared to a single-rod SAI. The PT tapered port threads match the G1/4 standard for this bore, and the adjustable air cushions at both ends ensure smooth deceleration without functioning as a position hold.
Airtac SAID40 Double Rod Cylinder SAID40X250S Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40X250S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 SAID40X250S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SAID40X250S Is Used
Symmetric Force Transfer
Ideal for shuttle systems requiring identical 528N push and pull forces at 0.5 MPa without recalculating cylinder sizing for direction changes.
Dual-Station Actuation
Drive a primary tool on the front rod while using the rear rod end to trip a DMSE electronic sensor or operate a secondary mechanism.
Anti-Rotation Slides
The twin-rod design prevents piston rotation during vertical or horizontal lifting, ensuring precise guidance for clamping and pressing jigs.
Is the Airtac SAID40 Double Rod Cylinder SAID40X250S the Right Cylinder?
Select this 40mm bore model when an application demands equal push and pull forces of 528N at 0.5 MPa (739N at 0.7 MPa) alongside dual-side stability. If your mechanism requires less force, stepping down to the 32mm bore yields 345N both ways; if higher thrust is needed, the 50mm bore provides 825N. Choose the SAID double-rod configuration over a single-rod SAI when you need to drive a secondary mechanism from the rear rod or require strict resistance to torsional load rotation.
For this 250mm stroke, the extended length is longer than a single-rod cylinder because the rod protrudes from both covers, meaning you must account for rear-rod clearance in your layout. At 250mm, the unsupported load length increases the risk of rod-bearing bending; use an external guide for heavy off-center loads. Remember that a plain SAID does not hold its position if air pressure drops—use a SAIL or BSAID for locking requirements. This cylinder is dimensionally interchangeable per ISO 15552 and uses the reduced SAID mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
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 SAID40X250S FAQ
Because the double-rod design subtracts the rod area from both sides of the piston, the force is equal in both directions. It provides 528N at 0.5 MPa, 739N at 0.7 MPa, and 950N at 0.9 MPa for both extend and retract strokes.
Yes, the SAID40X250-S is dimensionally interchangeable with other ISO 15552 profile cylinders and uses the same mounting interface. However, ensure your layout accommodates the rear rod protrusion, and note it uses the SAID mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) without FB, CA, CB, or CR brackets.
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