Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 280mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke280 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S
The AirTAC SAIJ125X280-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136N push force at 0.5 MPa and features a 240-280mm usable travel window, letting you trim the effective stroke by up to 40mm. The PT tapered port threads and carbon steel rod ensure durable, high-pressure operation.
This model includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors, which mount cleanly into the sensor grooves on both sides of the extruded aluminum barrel. The rear screw acts purely as a mechanical stop to fine-tune the end position during commissioning; it is not a locking device and requires live air to maintain load force.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 280 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X280-40S Is Used
Product Size Changeovers
Quickly dial in the 240-280mm travel window during format changes on packaging lines without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract end-stop during machine commissioning to perfect pressing or clamping force without adding external stops.
Heavy-Duty Positioning
Leverage the 6136N thrust to move heavy pallets or fixtures, relying on the 32mm rod to withstand demanding industrial loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X280-40S the Right Cylinder?
Select this 125mm bore cylinder when an application demands high thrust (6136N push at 0.5 MPa) alongside variable end-stop positioning. If you need less force, stepping down to a 100mm bore yields 3927N, while moving up to a 160mm bore provides 10053N. The adjustable stroke is ideal for product-size changeovers on a line, eliminating the need to swap out a fixed-stroke SAI cylinder or bolt on external stops.
For an exact ISO 15552 replacement, match the 125mm bore, 280mm stroke, 40mm adjustment range, PT port thread, and -S magnet. Because the 280mm stroke is substantial, the 32mm rod diameter handles significant side loads, but an external guide is still recommended for unsupported loads. Note that the SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR. For load-holding without live air pressure, consider an external rod lock or the SAIL/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 SAIJ125 Adjustable Cylinder SAIJ125X280-40S FAQ
The rear adjuster screw allows you to shorten the nominal 280mm stroke by up to 40mm, creating a 240-280mm usable travel window. It functions as a mechanical stop to set the end position and does not lock the load without live air.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
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