Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20S 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 SAIJ80AX270-20S
The AirTAC SAIJ80X270-20-S 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, utilizing a 25mm piston rod and G3/8 ports. Because it is an adjustable-stroke variant, the external rear stopper lets you fine-tune the effective travel down from the 270mm nominal stroke, creating a precise 250-270mm usable positioning window without swapping out the unit.
This specific configuration includes a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features a built-in magnet (-S) for position sensing. The magnet is fully compatible with AirTAC CMSE reed and DMSE electronic solid-state switches mounted into the dual sensor grooves on the extruded aluminum barrel. The rear screw acts purely as a travel stop to set the end position, meaning it does not lock or hold the load mechanically without continuous live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20S |
|---|---|
| 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 SAIJ80AX270-20S
| 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 SAIJ80AX270-20S Is Used
Machine Changeover
Dial in the 250-270mm travel window during product size changes without physically replacing the cylinder or adding external shims.
Variable End Stops
Set precise retraction limits for diverter arms or pusher plates on a packaging line, tweaking the final position via the rear screw.
Commissioning Calibration
Fine-tune the end-of-stroke position during initial machine setup to perfectly align tooling under load using the 20mm adjustment range.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20S the Right Cylinder?
Selecting this 80mm bore cylinder makes sense when your application requires the 2513N thrust at 0.5MPa (or 4523N at 0.9MPa) but demands on-the-fly end-position tuning during commissioning or product changeover. If your setup only requires 1402N of pull force, stepping down to a 63mm bore saves space, while moving up to a 100mm bore provides 3927N if your payload increases. The adjustable nature of this SKU provides a distinct advantage over a fixed-stroke SAI cylinder by allowing you to dial in the 250-270mm travel window precisely.
When matching an ISO 15552 replacement, verify the 270mm stroke, the 20mm adjustment range, PT tapered port threads, and the -S magnet option. Mounting choices for the SAIJ series include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the 270mm stroke is relatively long, ensure you provide an external guide to support the load and prevent excessive side-loading on the 25mm rod, and remember that for dead-load holding without air, you must integrate a SAIL or BSAI locking cylinder.
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 SAIJ80AX270-20S FAQ
At 0.5MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. If pressure is increased to 0.9MPa, the push force reaches 4523N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 270mm nominal stroke by up to 20mm, providing a usable travel window of 250-270mm. It only sets the end position and does not lock the load without live air pressure.
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