Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm bore and 280mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ50 mm
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20
The AirTAC SAIJ50X280-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 280 mm travel by up to 20 mm. This yields a usable stroke window of 260-280 mm, enabling precise end-position tuning at commissioning without swapping the barrel or adding external stops. The extruded aluminum barrel features sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
Delivering 982 N of push force and 825 N of pull force at 0.5 MPa, this 50 mm bore cylinder is built with a SUS420J2 stainless steel rod for enhanced durability against moisture. The rear adjuster acts purely as a mechanical travel stop to set the retract position, meaning it does not hold the load without live air pressure. For load-holding requirements without continuous pressure, consider an external pilot-operated check valve or the SAIL lock variant.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20 Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×280 | 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 SAIJ50 Adjustable Cylinder SAIJ50AX280-20 Is Used
Machine Changeover
Quickly reconfigure the retract distance by up to 20 mm during product size transitions on a packaging line without disassembling the pneumatic setup.
End-Stop Calibration
Fine-tune the 260-280 mm travel window during commissioning to achieve exact physical positioning against hard stops or sensing targets.
Assembly Station Tuning
Adjust the rear screw to dial in the exact pressing depth or clamping reach on automated assembly fixtures without changing the cylinder.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-20 the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end-stops or fine-tuning during product changeover, rather than committing to a fixed-stroke SAI cylinder. If your application demands less force, stepping down to a 40 mm bore yields 628 N of push force at 0.5 MPa, while moving up to a 63 mm bore provides 1559 N for heavier loads. To replace an ISO 15552 cylinder, match the 50 mm bore, 280 mm stroke, 20 mm adjustment, PT tapered G1/4 port, and Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interfaces.
Because this cylinder features a 280 mm stroke, the 20 mm piston rod and M16x1.5 rod thread will experience side-load leverage if the tooling is unsupported. For strokes of 280 mm and above, always use an external guide rail to prevent premature seal wear and binding.
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 SAIJ50 Adjustable Cylinder SAIJ50AX280-20 FAQ
The rear adjuster screw mechanically limits the retract stroke, allowing you to shorten the effective travel from 280 mm down to 260 mm. This creates a 260-280 mm usable window for fine-tuning the end position at commissioning without adding external stops.
At a 0.5 MPa operating pressure, the SAIJ50X280-20 provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
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