Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S
The AirTAC SAIJ125X125-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the 125 mm nominal stroke by up to 40 mm to achieve a precise 85-125 mm usable travel window. Delivering a robust 6136 N pull force at 0.5 MPa, it handles heavy actuation tasks while allowing fine end-position tuning during commissioning without swapping hardware. The standard carbon steel piston rod features an M27x2 thread, providing a durable interface for high-load couplings.
This configurable actuator includes a magnetic piston (-S) for position feedback, compatible with AirTAC CMSE reed and DMSE solid-state sensors that seat directly into the dual-side extruded aluminum barrel grooves. It utilizes PT tapered port threads (G1/2) and supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR foot and pivot brackets to streamline changeover setups.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-40S Is Used
Variable End-Stop Configuration
Ideal for packaging lines processing different carton sizes, allowing operators to dial in the 85-125 mm stroke window via the rear adjuster during format changeovers without adding external mechanical stops.
Heavy Assembly Pressing
Provides up to 6136 N of pull force at 0.5 MPa for seating bearings or joining components, with the 40 mm adjustment range enabling precise tuning of the pressing depth at machine commissioning.
Automated Clamp Positioning
Serves as a heavy-duty clamping actuator where the exact retract position varies by part family, utilizing the M27x2 rod thread for secure tool mounting and the magnetic piston for DMSE sensor feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-40S the Right Cylinder?
Select this 125 mm bore model when your application requires substantial thrust—such as 8590 N push at 0.7 MPa—combined with variable end-stop positioning. If your process demands less force, stepping down to a 100 mm bore yields 3681 N pull at 0.5 MPa, whereas larger 160 mm bores push 9425 N. The SAIJ125X125-40-S is specifically chosen over a fixed-stroke SAI when a product line requires frequent adjustments to the retract position, allowing you to trim the travel window from 125 mm down to 85 mm via the rear screw.
Because the rear adjuster functions strictly as a mechanical stop and the variable air cushions only manage deceleration, this cylinder cannot hold a load without live air pressure. For fail-safe load-holding, consider an external pilot-operated check valve or explore the SAIL or BSAI locking cylinder variants. Ensure your setup uses the correct PT port thread and matches the ISO 15552 mounting interface.
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 SAIJ125X125-40S FAQ
This 125 mm bore cylinder generates 6136 N pull and 8590 N push at 0.7 MPa. The 40 mm rear adjuster allows you to mechanically trim the 125 mm nominal stroke, providing an adjustable usable travel window of 85 to 125 mm.
No, the rear adjuster is a travel stop, not a lock, and the variable air cushions only manage end-of-stroke deceleration. The cylinder cannot hold position without live air; for fail-safe load-holding, use an external rod lock or explore AirTAC SAIL or BSAI series cylinders.
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