Airtac SAID40 Double Rod Cylinder SAID40X650
The AirTAC Airtac SAID40 Double Rod Cylinder SAID40X650 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAID40 Double Rod Cylinder SAID40X650
The AirTAC SAID40X650 is a double-acting, double-rod ISO 15552 profile cylinder featuring a 40mm bore and 650mm stroke. Because a carbon steel 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. It uses a PT G1/4 port and adjustable air cushions at both ends.
This through-rod layout allows you to mount the primary workpiece on one end while attaching a position flag, cam, or secondary mechanism to the rear rod. The twin-rod design provides superior anti-rotation guidance compared to a single-rod SAI, and the extruded aluminum barrel features dual sensor grooves for mounting AirTAC CMSE reed or DMSE electronic switches (requires the -S magnet option).
Airtac SAID40 Double Rod Cylinder SAID40X650 Technical Specifications
| Model | Airtac SAID40 Double Rod Cylinder SAID40X650 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 650 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 SAID40X650
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SAID40X650 Is Used
Symmetric Force Transfer
Ideal for pushing and pulling loads that require identical force and velocity, leveraging the equal annulus area of the twin rods.
Anti-Rotation Slides
The dual-rod architecture prevents piston rotation, providing precise linear guidance for machining or indexing fixtures.
Rear-Rod Sensing
Mounts a cam or limit flag on the rear rod end to trigger external mechanical valves or sensors without interfering with the primary work area.
Is the Airtac SAID40 Double Rod Cylinder SAID40X650 the Right Cylinder?
Choose this 40mm bore when an application demands perfectly symmetric force and speed, delivering 528N both ways at 0.5 MPa. If your mechanism requires less force, step down to the 32mm bore (345N both ways); if you need higher thrust, step up to the 50mm bore (825N both ways). Select the double-rod SAID over a single-rod SAI when you need dual-side guidance, anti-rotation stability, or rear-rod actuation. Note that a plain SAID does not hold its load when air pressure is lost; for position holding, consider the SAIL or BSAID series.
At 650mm, this stroke approaches the 800mm maximum for this bore, meaning the 16mm rod is highly unsupported. To prevent rod-bearing bending and premature seal wear under side loads, always use an external guide or linear rail. It is dimensionally interchangeable per ISO 15552 and uses the reduced SAID mounting set: Basic, FA, LB, TC, FTC, TCM1, TCM2 (omitting FB, CA, CB, CR).
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 SAID40X650 FAQ
Because the rod occupies both sides of the piston, the effective area is identical in both directions. It provides 528N of force at 0.5 MPa, 739N at 0.7 MPa, and 950N at 0.9 MPa on both extend and retract strokes.
Yes, it is dimensionally interchangeable with ISO 15552 profile cylinders. It supports a specific mounting subset including Basic, FA, LB, TC, FTC, TCM1, and TCM2, but does not use the FB, CA, CB, or CR mounts found on single-rod cylinders.
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