Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20 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 SAIJ80AX270-20
The AirTAC SAIJ80X270-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position without swapping components. Based on a 270 mm nominal stroke, the external stopper provides a usable travel window of 250-270 mm, letting you dial in the exact retract distance during commissioning. It delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa.
This unit is built with an SUS420J2 stainless steel rod for improved corrosion resistance and uses a PT tapered G3/8 port. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Remember that the rear adjuster functions strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20 |
|---|---|
| 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 SAIJ80AX270-20
| 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 SAIJ80AX270-20 Is Used
Machine Changeover
Quickly adjust the retract end-stop by up to 20 mm when switching between product sizes on a packaging line, avoiding physical cylinder swaps.
Position Calibration
Fine-tune the final resting position of a tooling head during commissioning to achieve exact alignment without adding external mechanical stops.
Assembly Pressing
Leverage the 2513 N push force at 0.5 MPa for pressing operations, using the adjustable stop to set precise contact depth limits.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-20 the Right Cylinder?
Choose this 80 mm bore when an application requires higher thrust than a 63 mm cylinder (which provides 1559 N push at 0.5 MPa), but does not need the full 3927 N output of a 100 mm unit. The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers, avoiding the need to maintain multiple fixed-stroke SAI cylinders. To match this ISO 15552 replacement exactly, specify the 80 mm bore, 270 mm stroke, 20 mm adjustment, PT G3/8 port, SUS420J2 rod, and no magnet.
Because the 270 mm stroke creates a longer unsupported rod extension, an external guide should be used to prevent excessive side-loading and premature seal wear. If the machine requires true load-holding without continuous air pressure, a standard SAIJ is insufficient; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ80AX270-20 FAQ
At 0.5 MPa, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. At 0.9 MPa, the push force increases to 4523 N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective travel from the 270 mm nominal stroke down to 250 mm, creating a 250-270 mm usable window. It sets the travel end but does not lock the load without live air.
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