Airtac SAID40 Double Rod Cylinder SAID40BX155
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX155 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40BX155
The AirTAC SAID40X155 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40 mm bore and a 155 mm stroke. Because the twin rods occupy both sides of the piston, the annulus area is identical in each direction, yielding exactly 528 N of force both extending and retracting at 0.5 MPa. This through-rod design allows you to mount a workpiece on the front rod end and a position flag or cam on the rear rod simultaneously.
This specific configuration uses SUS304 stainless steel (code B) for both rods to resist corrosion, alongside PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE solid-state switches. Note that the 155 mm stroke is a non-standard made-to-order length, and the overall extended length is longer than a single-rod SAI because the rear rod protrudes from the back cover.
Airtac SAID40 Double Rod Cylinder SAID40BX155 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX155 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAID40BX155
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAID40BX155 Is Used
Symmetric Force Transfer
Ideal for push-and-pull mechanisms requiring identical 528 N force both ways, ensuring consistent cycle times and balanced thrust without pressure compensation.
Anti-Rotation Slides
The dual SUS304 rods prevent piston rotation, providing precise linear guidance for sliding gates or tooling plates that cannot twist during movement.
Through-Rod Sensing
Mount the primary workpiece on the front rod while using the protruding rear rod end to trip a mechanical limit flag or drive a secondary mechanism.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX155 the Right Cylinder?
Select this 40 mm bore model when your mechanism requires perfectly symmetric thrust and speed, as it generates 528 N in both directions at 0.5 MPa. If your application demands less force, stepping down to a 32 mm bore yields 345 N both ways; if you need more power, the 50 mm bore provides 825 N. The twin-rod architecture is specifically chosen over a single-rod SAI when you need dual-side guidance, anti-rotation resistance, or rear-end actuation.
As a double-rod cylinder, the SAID40X155 is dimensionally interchangeable per ISO 15552, but it utilizes a reduced mounting accessory set: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting the FB, CA, CB, and CR options found on single-rod variants). Remember that the adjustable air cushions at both ends only decelerate the piston near stroke end; they do not hold the load. If your system loses air pressure, the piston will drift, requiring an external rod lock or a SAIL/BSAID locking cylinder for secure position holding.
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 SAID40BX155 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 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa for both extend and retract strokes.
Yes, it is dimensionally interchangeable with ISO 15552 profile cylinders, but the mounting set is reduced to Basic, FA, LB, TC, FTC, TCM1, and TCM2. The FB, CA, CB, and CR mountings are not compatible with this double-rod design.
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