Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50S 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 SAIJ125X240-50S
The AirTAC SAIJ125X240-50-S is a double-acting ISO 15552 profile cylinder featuring an external rear adjuster screw. This mechanism allows you to shorten the effective stroke by up to 50 mm, providing a usable travel window of 190-240 mm for precise end-position tuning during commissioning. It delivers 6136 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
Equipped with a magnet for position sensing, this unit works seamlessly with AirTAC CMSE reed and DMSE solid-state sensors. It uses PT tapered ports sized G1/2 and includes 40 mm of variable air cushioning at both ends. The extruded aluminum barrel design offers a true ISO 15552 mounting interface, utilizing a reduced SAIJ mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50S |
|---|---|
| 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 SAIJ125X240-50S
| 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 SAIJ125X240-50S Is Used
Machine Changeover
Dial in the 190-240 mm stroke window during product size transitions without physically replacing the cylinder or adding external stopper blocks.
Heavy Pressing
Leverage the 6136 N pull force at 0.5 MPa to seat heavy components, using the rear screw to fine-tune the exact pressing depth.
Commissioning Calibration
Trim the nominal 240 mm travel back by up to 50 mm to perfectly align tooling endpoints during initial machine setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-50S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust—such as the 6136 N pull force at 0.5 MPa—combined with variable end-stops for product-size changeovers. If your force requirements are lower, stepping down to a 100 mm bore yields 3681 N of pull force, whereas moving up to a 160 mm bore provides 9425 N. The adjustable stroke prevents the need to swap cylinders when dialing in a final position.
Because the rear adjuster acts only as a travel stop and the air cushions handle deceleration, neither can hold a load without live air pressure. For fail-safe load holding, consider an external pilot-operated check valve or the AirTAC SAIL lock cylinder series. This SAIJ125X240-50-S variant features a carbon steel rod, PT ports, and a -S magnet for sensor compatibility.
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 SAIJ125X240-50S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 50 mm. This creates a usable travel window of 190-240 mm, allowing you to fine-tune the retract position without changing the cylinder itself.
At 0.5 MPa operating pressure, it provides 6136 N of pull force and 8590 N of push force. The maximum thrust is 1251 kgf at 1.0 MPa.
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