Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-40
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-40 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 SAIJ80AX270-40
The AirTAC SAIJ80X270-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 230 to 270 mm usable travel window. Delivering 2513 N of push force and 2268 N of pull force at 0.5 MPa, it handles robust actuation tasks. The extruded aluminum barrel includes sensor grooves on both sides, and the rod is constructed from SUS420J2 stainless steel for enhanced corrosion resistance.
This model uses a PT tapered G3/8 port and relies on an external stopper screw to fine-tune the retract end position without adding external stops. The adjuster acts purely as a travel stop to set deceleration, not as a lock, meaning it cannot hold a load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-40 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-40 |
|---|---|
| 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 SAIJ80AX270-40
| 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 SAIJ80AX270-40 Is Used
Product Changeover Adjustment
Dial in the 230-270 mm travel window during packaging size changes without physically replacing the cylinder or bolting on external stopper blocks.
End-Position Truing
Fine-tune the retract stroke at machine commissioning to perfectly align a 2513 N clamping force against varying material thicknesses.
Variable Deceleration Setup
Use the rear stopper alongside the 36 mm air cushions to precisely set the travel end and deceleration profile for heavy moving loads.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX270-40 the Right Cylinder?
Choose this 80 mm bore when a 63 mm bore provides insufficient force (1559 N push at 0.5 MPa) or when you need to dial in the exact end-of-stroke position during machine commissioning or product changeover. The 40 mm adjustment range allows you to adapt the travel window on the fly, avoiding the need to physically swap out a fixed-stroke SAI cylinder. The PT port thread and G3/8 fitting size must be matched to your existing pneumatic plumbing.
Because the 270 mm stroke is moderately long, the 25 mm rod diameter and M20x1.5 rod thread provide rigidity, but an external guide is still recommended to prevent excessive side-loading on the piston. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2. The standard configuration omits the -S magnet, so position sensing requires adding a magnet or using external sensors.
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 SAIJ80AX270-40 FAQ
At 0.5 MPa operating pressure, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 513 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 270 mm stroke by up to 40 mm, resulting in a usable travel window of 230 to 270 mm. It sets the end position but does not lock the load without live air pressure.
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