Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 290mm 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
- Stroke290 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S
The AirTAC SAIJ125X290-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear mechanical stroke adjuster. It provides a 290 mm nominal stroke that can be dialed back by up to 75 mm, yielding a precise 215-290 mm usable travel window for on-the-fly end-position tuning. In the 125 mm bore class, it delivers 6136 N push and 5734 N pull thrust at 0.5 MPa, making it suitable for moving heavy payloads.
This variant includes a standard carbon steel piston rod, PT tapered port threads, and a built-in magnet for position sensing. The extruded aluminum barrel features sensor grooves on both sides, enabling direct mounting of AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster functions strictly as a travel stop for deceleration and positioning, not as a load-holding lock, while adjustable air cushions at both ends manage end-of-stroke impact.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 290 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 SAIJ125X290-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×290 | 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 SAIJ125X290-75S Is Used
Variable End-Stop Positioning
Dial the rear adjuster to shift the 215-290 mm travel window, setting exact retraction points for different product sizes on a single fixture.
Heavy Payload Changeover
Leverage 6136 N of thrust at 0.5 MPa to push heavy assemblies, fine-tuning the end stop during machine setup without replacing the cylinder.
Commissioning Calibration
Trim the effective stroke up to 75 mm during initial machine commissioning to perfect timing and avoid mechanical hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X290-75S the Right Cylinder?
Select this 125 mm bore adjustable-stroke cylinder when your application requires exact end-position calibration during commissioning or product changeovers without swapping out physical components. Stepping down to a 100 mm bore reduces the 0.5 MPa push force to 3927 N, whereas moving up to a 160 mm bore increases it to 10053 N. Because the 290 mm stroke exceeds 300 mm when combined with the 75 mm adjustment range, an external guide is recommended to manage side loads and prevent rod binding.
The SAIJ series utilizes a specific subset of ISO 15552 mounting interfaces: Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR configurations. If your machine requires true fail-safe load holding without sustained live air pressure, a standard SAIJ cylinder will not suffice; consider the AirTAC SAIL pneumatic lock, BSAI clamp-lock, or an external pilot-operated check valve instead. This -S model's magnetic piston pairs seamlessly with DMSE solid-state sensors for high-speed switching reliability.
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 SAIJ125X290-75S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can output up to 1251 kgf.
The rear adjusting screw acts as a mechanical stop that shortens the effective stroke from the 290 mm nominal length down to a minimum of 215 mm. It sets the travel end and deceleration point, but it does not lock or hold the load without continuous live air pressure.
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