Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40
The AirTAC SAIJ125X40-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of pull force at 0.5 MPa. It features a 40mm nominal stroke that can be dialed back by up to 40mm, providing a highly versatile 0-40mm usable travel window for exact end-position tuning. This cylinder uses a PT tapered port and a robust 32mm carbon steel rod with an M27x2 thread.
The external rear stopper allows operators to fine-tune the retract position at commissioning without swapping the cylinder or adding external stops. The adjuster acts solely as a travel stop and works alongside the 40mm air cushion to decelerate the load; it does not hold the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-40 Is Used
Product Changeover Tuning
Dial in the exact 0-40mm retract stop during product size changeovers on a packaging line without physically swapping out the actuator.
End-Stop Calibration
Achieve precise end-position calibration during machine commissioning by trimming the nominal stroke back to perfectly meet the tooling interface.
Variable Depth Clamping
Adjust the travel window on the fly for high-force clamping stations that handle multiple part thicknesses within a 0-40mm range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-40 the Right Cylinder?
Choose this 125mm bore cylinder when your application requires substantial thrust—such as the 6136N pull force at 0.5 MPa—and on-the-fly end-position adjustments. If your machine changeover needs less force, stepping down to a 100mm bore yields 3681N pull force, while stepping up to a 160mm bore provides 9425N. The adjustable stroke is ideal for variable product-size lines, whereas a fixed-stroke SAI cylinder is better for repetitive single-depth tasks.
When replacing an ISO 15552 cylinder, match the 125mm bore, 40mm stroke, 40mm adjustment range, PT port thread, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that SAIJ omits the FB, CA, CB, and CR mounts. This SKU does not include a magnet; adding an -S suffix enables CMSE reed or DMSE solid-state sensors in the dual-side barrel grooves.
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 SAIJ125X40-40 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of pull force and 6136N of push force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster allows you to shorten the effective stroke from its 40mm nominal length down to 0mm, creating a 0-40mm usable travel window. The adjuster acts as a mechanical stop to set the retract end-position and is not a locking device.
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