Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20S
The AirTAC Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20S 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 SAIJ80X250-20S
The AirTAC SAIJ80X250-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 25 mm rod and M20x1.5 thread, delivering 2513 N of push force at 0.5 MPa. The built-in rear stopper allows you to trim the effective travel back by up to 20 mm, creating a usable 230-250 mm window for precise end-position tuning during commissioning.
Equipped with a magnet for position detection, this variant works seamlessly with AirTAC CMSE reed and DMSE solid-state sensors fitted into the dual-side barrel grooves. The extruded aluminum body uses a G3/8 port and omits the FB, CA, CB, and CR mounting interfaces, offering a focused set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20S Technical Specifications
| Model | Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20S |
|---|---|
| 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 SAIJ80X250-20S
| 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 SAIJ80X250-20S Is Used
Machine Setup & Changeover
Dial in the exact 230-250 mm end-position during product family transitions without replacing the cylinder or adding external mechanical stops.
Variable End-Stop Positioning
Fine-tune the retract stroke by up to 20 mm on the fly to accommodate material thickness variations or tooling wear on the production line.
Assembly Line Actuation
Leverage 2513 N of thrust at 0.5 MPa for heavy pressing or lifting tasks, using the PT-threaded G3/8 port for robust pneumatic flow.
Is the Airtac SAIJ80 Adjustable Cylinder SAIJ80X250-20S the Right Cylinder?
Choose this 80 mm bore when an application requires 2513 N of thrust at 0.5 MPa, bridging the gap between the 63 mm bore (1559 N) and the 100 mm bore (3927 N). The adjustable stroke is ideal for product changeovers where the exact end-stop shifts slightly, saving you from swapping out a fixed-stroke SAI cylinder or adding bulky external stops.
Because the 250 mm stroke is substantial, ensure adequate side-load support with an external guide to protect the rod. Remember that the rear adjuster acts only as a travel stop and the air cushions only decelerate the load; neither will hold the position without live air pressure. For true fail-safe load holding, consider the SAIL or BSAI series instead.
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 SAIJ80X250-20S FAQ
At 0.5 MPa operating pressure, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. It can deliver up to 4523 N of push force at its maximum 0.9 MPa pressure.
The rear external adjusting screw acts as a mechanical stopper that lets you shorten the nominal 250 mm stroke by up to 20 mm, providing a usable travel window of 230-250 mm. The adjuster only sets the travel end and does not lock or hold the load without continuous live air pressure.
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