Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-50
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-50 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 SAIJ80AX250-50
The AirTAC SAIJ80X250-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 2513N of push force at 0.5 MPa. Its 250mm nominal stroke can be dialed back by up to 50mm, creating a precise 200-250mm usable travel window. This allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops.
This unit features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and carries a robust M20x1.5 rod thread. PT tapered port threads seal securely, while the extruded aluminum barrel includes sensor grooves on both sides. The rear adjuster acts purely as a travel stop for deceleration alongside the standard air cushions, meaning it will not hold a load without live air pressure.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-50 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-50 |
|---|---|
| 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 SAIJ80AX250-50
| 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 SAIJ80AX250-50 Is Used
Product Changeover
Dial in the 200-250mm travel window during format changes on a packaging line without replacing the actuator.
Machine Setup
Fine-tune the retract end position at commissioning to dial out mechanical interference precisely.
Variable End Stops
Adjust the stroke on the fly for diverter arms handling different package lengths on a conveyor.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-50 the Right Cylinder?
Select this 80mm bore when an application requires roughly 2513N push force at 0.5 MPa, stepping up from a 63mm bore that provides 1559N, or down from a 100mm bore yielding 3927N. The 50mm adjustment range is ideal for product-size changeovers on a line, letting you set variable end-stops on the fly instead of machining new hard stops. For load-holding without continuous air pressure, this cylinder is insufficient; you should specify an AirTAC SAIL or BSAI lock variant instead.
When replacing an ISO 15552 cylinder, match the 80mm bore, 250mm stroke, 50mm adjustment, PT port threads, and the exact mounting accessory. SAIJ supports a reduced set of mounts: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 250mm stroke is moderately long, ensure external guide rails support the load to prevent excessive side-loading on the M20x1.5 rod.
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 SAIJ80AX250-50 FAQ
At 0.5 MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At 0.7 MPa, the push force increases to 3518N.
The rear adjuster screw lets you shorten the 250mm nominal stroke by up to 50mm, providing a usable travel window of 200-250mm. It functions as a mechanical stop for end-position tuning and does not lock the load without live air.
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