Airtac SAID40 Double Rod Cylinder SAID40X850S
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40X850S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40X850S
The AirTAC SAID40X850-S is a double-acting, double-rod ISO 15552 profile cylinder featuring a built-in magnet for position sensing. Because the piston rod exits both end covers, the effective annulus area is identical on both sides, yielding exactly 528 N of output force at 0.5 MPa in both extend and retract directions. This 850 mm stroke is a made-to-order non-standard length, requiring extra rear-rod clearance in your machine layout.
Equipped with a standard carbon steel rod and PT threaded ports, it integrates seamlessly with existing pneumatic setups. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic switches precisely where needed for dual-end confirmation. Adjustable air cushions at both ends absorb kinetic energy, though they do not function as a locking mechanism.
Airtac SAID40 Double Rod Cylinder SAID40X850S Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40X850S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 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 SAID40X850S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×850 | 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 SAID40X850S Is Used
Symmetric Force Transfer
Drives a shuttle mechanism where the identical 528 N extend and retract forces ensure perfectly balanced acceleration and deceleration without tweaking flow controls.
Anti-Rotation Slides
The twin-rod geometry prevents the tooling plate from twisting during the 850 mm traverse, maintaining precise linear guidance without external rails.
Dual-Side Actuation
Mounts the primary workpiece on the front rod extension while utilizing the rear rod end to mechanically trigger a secondary sequence or hard limit.
Is the Airtac SAID40 Double Rod Cylinder SAID40X850S the Right Cylinder?
Selecting this 40 mm bore makes sense when an application demands equal push and pull forces (528 N at 0.5 MPa) and superior anti-rotation resistance compared to a single-rod SAI. If your project requires less force, the 32 mm bore offers 345 N; if you need more thrust, stepping up to the 50 mm bore provides 825 N. The twin-rod design is ideal for mounting a workpiece on the front rod and a cam or position flag on the rear rod.
At 850 mm, this non-standard stroke exceeds the 40 mm bore's 800 mm standard maximum, meaning it is manufactured as a special order. Because long, unsupported strokes are susceptible to rod-bearing bending and side loads, incorporating an external guide is highly recommended to prevent premature wear. For drop-in replacements, ensure the ISO 15552 dimensions, G1/4 port, and mounting accessories (Basic, FA, LB, TC, FTC, TCM1, TCM2) match your existing footprint. If the machine must hold a load without live air pressure, a plain SAID will drift; you should 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 SAID40X850S FAQ
Because it is a double-rod cylinder, the effective piston area is the same on both sides. It provides an equal force of 528 N in both directions at 0.5 MPa, and 739 N at 0.7 MPa.
Yes, the SAID40X850-S is dimensionally interchangeable per ISO 15552. You can use it as a drop-in replacement for other ISO 15552 profile cylinders, provided your mounting hardware uses the Basic, FA, LB, or TC styles.
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