Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40S 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 SAIJ50AX280-40S
The AirTAC SAIJ50X280-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 280 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a highly flexible 240-280 mm usable travel window. Delivering 982 N of push force at 0.5 MPa, it fits perfectly into medium-force pneumatic setups. The extruded aluminum barrel incorporates sensor grooves on both sides, and this specific SKU includes a magnet for position detection.
This model is built with an SUS420J2 stainless steel rod (option A) for superior corrosion resistance and uses PT tapered port threads. The rear adjuster functions strictly as a mechanical stop to dial in the end position during commissioning or product changeovers without swapping the cylinder. It is important to note that this adjuster, alongside the standard variable air cushions at both ends, only decelerates the travel; it does not hold the load without live air pressure.
Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40S |
|---|---|
| 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 SAIJ50AX280-40S
| 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 SAIJ50AX280-40S Is Used
Variable End-Stop Positioning
Dial in the 240-280 mm travel window during product changeovers to accommodate different package sizes without physically swapping cylinders or adding external mechanical stops.
Machine Setup Fine-Tuning
Use the 40 mm rear adjustment screw to perfectly tune the retract end-position during initial commissioning, absorbing minor mechanical tolerances in the fixture design.
Mid-Range Transfer Pushing
Leverage the 982 N push force at 0.5 MPa to reliably push or divert products on a conveyor line, utilizing the SUS420J2 stainless rod for environments requiring corrosion resistance.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50AX280-40S the Right Cylinder?
Choose this 50 mm bore when an application requires around 982 N of thrust at 0.5 MPa, stepping up from a 40 mm bore (628 N) or down from a 63 mm bore (1559 N). An adjustable-stroke cylinder is selected over a fixed-stroke SAI when you need precise end-position tuning at machine setup or variable end-stops for different product sizes on the same line. Because the 280 mm stroke exceeds 300 mm is false here, but it is still long enough that side-load management is recommended; use an external guide rail to prevent rod wear on long unsupported travels. If true load-holding without continuous air pressure is required, this cylinder is not a lock; consider the SAIL or BSAI series instead. For a direct ISO 15552 replacement match, specify: 50 mm bore, 280 mm stroke, 40 mm adjustment, PT port, Basic/FA/LB/TC/FTC/TCM1/TCM2 mounting, and the -S magnet option.
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 SAIJ50AX280-40S FAQ
At a 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 200 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke from its nominal 280 mm down to as little as 240 mm. This creates a 40 mm tuning window for precise end-positioning without replacing the cylinder.
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