Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-20S 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 SAIJ80AX250-20S
The AirTAC SAIJ80X250-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel. With a 250 mm nominal stroke and a 20 mm adjustment range, it provides a usable 230-250 mm travel window to perfectly dial in end positions during commissioning. This bore delivers 2513 N of push force at 0.5 MPa, making it suitable for medium to heavy loads.
This variant includes a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and ships with a magnet (-S) for use with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel features sensor grooves on both sides, and the mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments, omitting FB, CA, CB, and CR.
Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-20S |
|---|---|
| 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 SAIJ80AX250-20S
| 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 SAIJ80AX250-20S Is Used
Product Changeover
Dial in the 230-250 mm travel window during format changeovers on packaging lines, using the rear screw to set new end positions without adding external stops.
Machine Setup
Fine-tune the exact end-of-stroke position during commissioning to prevent mechanical crashes, leveraging the 20 mm adjustment range on a heavy 2513 N force cylinder.
Variable End Stops
Handle varying package sizes on a conveyor by adjusting the retract stroke by up to 20 mm, accommodating different push-off distances on the fly.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80AX250-20S the Right Cylinder?
Select this 80 mm bore when an application requires around 2513 N of push force at 0.5 MPa, stepping up from a 63 mm bore (1559 N) or down from a 100 mm bore (3927 N). The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers, allowing precise tuning without swapping the hardware. Because the stroke is 250 mm, ensure external guiding is used to prevent excessive side-loading on the M20x1.5 rod thread.
For a true ISO 15552 dimensional replacement, match the 80 mm bore, 250 mm stroke, 20 mm adjustment, PT tapered ports, and the -S magnet. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an external rod lock or a SAIL/BSAI variant.
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 SAIJ80AX250-20S FAQ
At 0.5 MPa, this 80 mm bore cylinder provides 2513 N of push force and 2268 N of pull force. It operates efficiently at speeds between 30 and 800 mm/s.
The rear adjuster screw allows you to shorten the 250 mm nominal stroke by up to 20 mm, creating a 230-250 mm usable travel window. It functions as a mechanical stop to fine-tune the retract position and is not a locking device.
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