Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S
The AirTAC SAIJ125X140-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 100 to 140 mm, allowing you to dial back the nominal 140 mm stroke by up to 40 mm during commissioning. This bore size delivers substantial thrust, yielding 6136 N of push force and 5734 N of pull force at a 0.5 MPa operating pressure. Equipped with a standard magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors via the dual-side barrel grooves.
The carbon steel piston rod features an M27x2 thread, providing a robust interface for high-load couplings. Unlike fixed-stroke SAI units, this adjustable model uses an external rear stopper to set the retract end position without adding external physical stops. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAIJ125X140-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SAIJ125X140-40S Is Used
Machine Changeover
Quickly reconfigure the 100-140 mm travel window when switching product sizes on a packaging line, eliminating the need to physically swap cylinders.
Precision End-Stop Tuning
Dial in the exact retract position during machine commissioning using the rear adjuster, ensuring perfect alignment without external mechanical stops.
Heavy-Duty Forming
Leverage the 6136 N of push force at 0.5 MPa for pressing or clamping applications where the exact end-position needs on-the-fly adjustment.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X140-40S the Right Cylinder?
Choose this 125 mm bore cylinder when an application demands high force combined with variable end-stop positioning. If your setup requires less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa. The adjustable stroke is highly advantageous for product-size changeovers on a line, as it allows rapid fine-tuning of the travel end without swapping the cylinder. For load-holding without live pressure, this unit is insufficient; consider the SAIL air-released lock or BSAI clamp-lock cylinders instead.
To match this ISO 15552 interchangeable cylinder exactly, specify a 125 mm bore, 140 mm nominal stroke, 40 mm adjustment range, PT tapered port thread, and the -S magnet option. Operating speed is 30-500 mm/s, and the unit includes variable air cushions at both ends to manage kinetic energy. The standard carbon steel rod is suitable for general industrial environments.
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 SAIJ125X140-40S FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the effective stroke from 140 mm down to as little as 100 mm, providing a 40 mm tuning window for precise end-position setup.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, the push force increases to 11045 N.
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