Airtac SAID40 Double Rod Cylinder SAID40AX850S
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40AX850S 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 SAID40AX850S
The AirTAC SAID40X850-S is a double-acting, double-rod ISO 15552 profile cylinder. Because a rod extends from both end covers, the annulus area is identical on extend and retract, yielding equal 528 N of force in each direction at 0.5 MPa. This through-rod geometry is ideal for mounting a primary workpiece on one end and a cam or position flag on the rear extension.
Configured with a SUS420J2 stainless steel rod (material code A) and a PT tapered port thread, this unit includes a magnet (-S) for use with AirTAC CMSE reed and DMSE solid-state sensors. The 850 mm stroke is a made-to-order non-standard length exceeding the 800 mm standard maximum, meaning the overall physical length is longer than a single-rod SAI and requires extra rear-rod clearance in your machine layout.
Airtac SAID40 Double Rod Cylinder SAID40AX850S Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40AX850S |
|---|---|
| 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 SAID40AX850S
| 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 SAID40AX850S Is Used
Symmetric Force Transfer
Drives a transfer shuttle where the extend and retract cycles move equal masses at identical speeds, leveraging the 528 N both-way output to balance the motion profile without tuning pressure.
Anti-Rotation Guided Slide
Uses the twin-rod structure to prevent piston rotation in a vertical lifting slide, ensuring the tool plate remains perfectly aligned throughout the 850 mm travel.
Rear-Cam Positioning
Mounts the primary work tool on the front rod extension while utilizing the rear rod end to drive a mechanical cam or position flag for external mechanical sequencing.
Is the Airtac SAID40 Double Rod Cylinder SAID40AX850S the Right Cylinder?
Select this 40 mm bore when an application demands symmetric push and pull forces, which a single-rod SAI cannot provide. If your process requires less force, the neighbouring 32 mm bore yields 345 N each way; if you need more power, step up to the 50 mm bore for 825 N. The twin-rod design inherently resists piston rotation, making it superior for guided slides and dual-station actuation.
Because the 850 mm stroke exceeds the standard maximum, it is manufactured as a special order. At this length, the unsupported rod is highly susceptible to side-load bending and rod-bearing wear; always pair the cylinder with an external linear guide to support the load. Remember that the adjustable air cushions at both ends only decelerate the piston near stroke end—they do not lock or hold the load. If unpowered position holding is required, use an SAIL lock, BSAID clamp-lock, or external rod lock. For ISO 15552 drop-in replacement, match the 40 mm bore, 850 mm stroke, PT port, and mounting accessory (choose from Basic, FA, LB, TC, FTC, TCM1, or TCM2—FB, CA, CB, and CR are single-rod 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 SAID40AX850S FAQ
The double-rod design means the push and pull forces are equal because the rod area subtracts from both sides of the piston. It generates 528 N in both directions at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa.
Yes, the SAID profile cylinder is dimensionally interchangeable per ISO 15552. You can use it as a drop-in replacement for other ISO 15552 double-rod cylinders by matching the 40 mm bore, 850 mm stroke, and PT port, utilizing the standard mounting interface.
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