Airtac SAID40 Double Rod Cylinder SAID40BX85S
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40BX85S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 85mm 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
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAID40 Double Rod Cylinder SAID40BX85S
The AirTAC SAID40X85-S is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm bore and 85mm stroke. Because the piston rod extends from both end covers, the annulus area is identical on both sides, yielding exactly 528N of force in both extend and retract directions at 0.5 MPa. This symmetric output is ideal for mechanisms requiring consistent power and velocity regardless of travel direction.
Equipped with a magnet for position sensing, this variant uses SUS304 stainless steel rods for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. A rod protruding from the rear cover allows you to mount a secondary cam, position flag, or drive a second mechanism simultaneously.
Airtac SAID40 Double Rod Cylinder SAID40BX85S Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40BX85S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAID40BX85S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SAID40BX85S Is Used
Symmetric Force Transfer
Drives a transfer carriage where the 528N output at 0.5 MPa must remain identical in both directions, preventing speed variations during continuous back-and-forth shuttling.
Anti-Rotation Slides
Uses the twin 16mm SUS304 rods to guide a vertical lifting slide, mechanically preventing platform twist without needing external linear bearings.
Rear-End Sensing Flag
Mounts a physical cam on the rear rod end to trigger an external mechanical limit switch, while the internal magnet works with DMSE electronic sensors for primary positioning.
Is the Airtac SAID40 Double Rod Cylinder SAID40BX85S the Right Cylinder?
Select this 40mm bore when an application demands equal push and pull forces, specifically 739N at 0.7 MPa. If your mechanism requires less force, stepping down to the 32mm bore provides 345N at 0.5 MPa, while upgrading to the 50mm bore offers 825N. The double-rod design is chosen over a single-rod SAI when you need dual-side guidance to prevent rotation, or require a rear rod end for external tracking. Remember that the adjustable air cushions only decelerate the piston near stroke end; they do not hold a load. If static holding without air pressure is required, consider a SAIL lock cylinder or an external pilot-operated check valve.
As a dimensionally interchangeable ISO 15552 cylinder, it serves as a drop-in replacement for other standard profile cylinders. It uses PT tapered port threads (G1/4) and supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The 16mm rod and M12x1.25 thread provide a robust interface for moderate side loads, though external guides are recommended for any heavy off-center loads.
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 SAID40BX85S FAQ
Because it is a double-rod cylinder, 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 extension and retraction.
Yes, it shares standard ISO 15552 mounting dimensions, making it a drop-in replacement for other profile cylinders. It supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, but omits FB, CA, CB, and CR.
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