Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-75
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-75 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 SAIJ80AX250-75
The AirTAC SAIJ80X250-75 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 75mm, creating a precise 175-250mm usable travel window for on-the-fly end-position tuning. This adjuster acts strictly as a mechanical stop to set the retract endpoint, meaning it will not hold a load without continuous live air pressure.
This unit features a SUS420J2 stainless steel rod for superior corrosion resistance and PT tapered port threads on its G3/8 air supply. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting, while the robust 25mm rod diameter handles high side loads effectively during operation.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-75 Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-75 |
|---|---|
| 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 SAIJ80AX250-75
| 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 SAIJ80AX250-75 Is Used
Product Size Changeovers
Dial in the 175-250mm travel window during production line changeovers to accommodate varying package sizes without changing the cylinder.
Machine Setup Tuning
Fine-tune the retract end position at commissioning using the rear stopper, avoiding the need to machine custom external spacers.
Variable End Stops
Provide adjustable mechanical endpoints for automated tooling that requires flexible positioning within a 75mm range.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-75 the Right Cylinder?
Choose this 80mm bore cylinder when an application requires the 2513N push force at 0.5 MPa, stepping up from a 63mm bore that provides 1559N. The 75mm adjustment range is ideal for product changeovers on a line, allowing operators to fine-tune the 175-250mm travel window without swapping cylinders or adding external stops. For load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is not a lock.
When replacing an ISO 15552 cylinder, match the 80mm bore, 250mm stroke, 75mm adjustment, PT G3/8 port, and standard mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, deliberately omitting FB, CA, CB, and CR options. Because the 250mm stroke is substantial, ensure external guiding is used to prevent rod binding under heavy lateral loads.
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 SAIJ80AX250-75 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 acts as a mechanical stop that shortens the 250mm nominal stroke by up to 75mm, yielding a usable travel window of 175-250mm. It sets the end position but does not lock the load without live air.
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