Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 270mm stroke, G3/8 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ80 mm
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40
The AirTAC SAIJ80X270-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 2513N push force at 0.5MPa, making it well-suited for heavy-duty positioning tasks. By integrating an external adjusting screw at the rear, this model allows you to trim the effective travel back by up to 40mm, creating a precise 230-270mm usable stroke window without needing external stops.
This cylinder features a carbon steel piston rod with an M20x1.5 thread, paired with PT (tapered) porting and a G3/8 air connection. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Because the stroke reaches 270mm, the 25mm rod diameter provides essential rigidity, though an external guide is still recommended to manage side loads on longer travels.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 270 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×270 | 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 SAIJ80 Adjustable Cylinder SAIJ80X270-40 Is Used
Machine Changeover
Dial in the 230-270mm retract position during product size changes without replacing the cylinder or adding external mechanical stops.
Commissioning Calibration
Fine-tune the end-of-stroke position during initial setup to perfectly align heavy fixtures using the 40mm rear adjustment screw.
Variable End Stops
Adjust the effective stroke dynamically on packaging lines to accommodate different carton sizes on the fly.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X270-40 the Right Cylinder?
Choose this 80mm bore when your application requires more thrust than a 63mm cylinder can provide (1559N push at 0.5MPa), but does not necessitate stepping up to a 100mm bore (3927N push at 0.5MPa). The adjustable-stroke design is selected over a fixed-stroke SAI cylinder when you need to fine-tune the retract end position during commissioning or accommodate product changeovers without physically swapping the actuator.
When specifying a replacement, ensure you match the 80mm bore, 270mm stroke, 40mm adjustment range, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster functions strictly as a travel stop and does not hold the load without live air pressure; for dead-air load holding, consider an AirTAC SAIL or BSAI cylinder. Since the 270mm stroke exceeds 300mm is false, standard side-load precautions apply, but always ensure adequate guiding for the payload.
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 SAIJ80 Adjustable Cylinder SAIJ80X270-40 FAQ
The rear adjusting screw acts as a mechanical stopper, allowing you to shorten the nominal 270mm stroke by up to 40mm. This creates a usable travel window of 230-270mm, which can be fine-tuned during commissioning without changing the cylinder's physical mounting.
At a standard operating pressure of 0.5MPa, this 80mm bore cylinder provides a push force of 2513N and a pull force of 2268N. At 0.7MPa, the push force increases to 3518N.
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