Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S
The AirTAC SAIJ125X240-40-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N pull force at 0.5 MPa and incorporates a magnetic piston for position detection. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic solid-state switches without extra brackets.
This specific SKU provides a nominal 240mm stroke with a 40mm adjustment range, yielding a usable travel window of 200 to 240mm. This built-in adjustability allows operators to dial in exact retract end-positions during commissioning or product changeovers without swapping the cylinder or adding external stops. The rear screw functions as a travel stop paired with adjustable air cushions to manage deceleration, but it does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAIJ125X240-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SAIJ125X240-40S Is Used
Variable End-Stop Tuning
Dial in the retract position anywhere between 200 and 240mm during machine commissioning to perfectly match tooling heights without disassembling the actuator.
Product Size Changeover
Quickly adapt the cylinder's effective stroke on packaging lines when switching between different product lengths, minimizing downtime between production runs.
High-Force Positioning
Leverage the 6136N pull force to move heavy pallets or fixtures, relying on the built-in adjustment screw to set the precise retract distance for automated assembly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-40S the Right Cylinder?
Choose this 125mm bore when your application requires high force, specifically the 6136N pull or 8590N push available at 0.5 MPa. If your process needs less thrust, stepping down to a 100mm bore drops the 0.5 MPa push force to 3927N while maintaining the same 30-800mm/s speed range. Conversely, moving up to a 160mm bore increases the 0.5 MPa push force to 10053N but reduces the standard speed range to 30-500mm/s.
An adjustable-stroke SAIJ is selected over a fixed SAI when a machine requires variable end-stops for size changeovers or fine-tuning at setup. Because the 240mm stroke is under the 1500mm maximum standard stroke for this bore, it ships as a standard configuration. For load-holding without continuous air pressure, note that this cylinder's adjuster is strictly a stop; you would need an external pilot-operated check valve or a related SAIL pneumatic lock cylinder. This unit is dimensionally interchangeable per ISO 15552 and uses a PT tapered port, with mounting options limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X240-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster allows you to shorten the effective travel from the nominal 240mm down to 200mm. It acts as a mechanical stop to fine-tune the end position, but it is not a lock and will not hold the load without live air pressure.
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