Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø80mm bore and 250mm 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
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20
The AirTAC SAIJ80X250-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 230 to 250 mm, allowing you to dial back the nominal 250 mm stroke by up to 20 mm during commissioning. Delivering a robust 2513 N push force at 0.5 MPa, it handles heavy dynamic loads with ease.
This model uses a G3/8 port and a 25 mm carbon steel rod with an M20x1.5 thread, offering excellent resistance to side loads. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rear adjuster functions strictly as a travel stop for end-position tuning, not a lock, so live air is required to hold the load.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø80 mm |
| Stroke | 250 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 SAIJ80X250-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SAIJ80X250-20 Is Used
Machine Changeover
Dial in the 230-250 mm travel window during product size changes without physically swapping the cylinder or adding external shims.
End-Position Tuning
Fine-tune the retract stopper at commissioning to hit exact datum points on heavy fixtures, absorbing impact with the 36 mm air cushion.
Variable End-Stops
Adjust the stroke dynamically on packaging lines to accommodate different carton sizes within the 20 mm adjustment range.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20 the Right Cylinder?
Choose this 80 mm bore when a 50 mm bore (982 N push at 0.5 MPa) is insufficient and a 100 mm bore (3927 N) would be oversized. An adjustable stroke is selected over a fixed SAI cylinder when you need to fine-tune the retract end-position on the fly without swapping components or adding external stops. For position holding without live air pressure, consider the SAIL or BSAI series, as the SAIJ adjuster is not a brake. This configuration includes a PT tapered port, no magnet, and a 250 mm stroke. Since the stroke is 250 mm, ensure adequate external guiding to prevent rod side-load issues.
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 SAIJ80X250-20 FAQ
At 0.5 MPa, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. At the maximum operating pressure of 1.0 MPa, it delivers up to 513 kgf.
The rear adjuster screw acts as a mechanical stop, letting you shorten the effective travel from the nominal 250 mm down to 230 mm. It sets the end position but does not lock the load without live air.
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