Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30 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 SAIJ125X240-30
The AirTAC SAIJ125X240-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 240 mm nominal stroke that can be dialed back by up to 30 mm, yielding a usable travel window of 210-240 mm. This built-in adjustability allows you to fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops.
Operating at 0.5 MPa, this 125 mm bore generates 6136 N of push force and 5734 N of pull force. The carbon steel rod features an M27x2 thread, and air is supplied via PT G1/2 ports. It includes variable air cushions at both ends with a 40 mm stroke absorption length, and the extruded aluminum barrel offers sensor grooves on both sides for flexible switch placement.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30 |
|---|---|
| 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 SAIJ125X240-30
| 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 SAIJ125X240-30 Is Used
Adjustable End-Positioning
Dial in the exact retract distance within the 210-240 mm window during machine commissioning to accommodate varying product sizes without hardware changes.
Product Changeover Systems
Quickly alter the effective stroke by up to 30 mm when switching production lines to different material thicknesses, minimizing downtime.
High-Force Assembly Stations
Leverage the 6136 N of thrust at 0.5 MPa for heavy pressing or clamping tasks where the precise end-stop must be tuned on-site.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-30 the Right Cylinder?
Choose this 125 mm bore when your application requires over 6000 N of thrust at 0.5 MPa; stepping down to an 80 mm bore drops the push force to 2513 N. An adjustable stroke is preferred over a fixed SAI cylinder when you need a variable end-stop for product changeovers or precise machine setup. The rear adjuster acts strictly as a travel stop to decelerate the load and does not hold position without live air; for true load-holding without pressure, consider the SAIL or BSAI series.
This SAIJ125X240-30 is dimensionally interchangeable per ISO 15552. It supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). With a 240 mm stroke, the M27x2 rod handles side loads well, but long unsupported strokes still require an external guide. Because no magnet is specified, position sensing via CMSE or DMSE switches is not supported on this specific configuration.
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 SAIJ125X240-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. It can reach up to 8590 N push force at 0.7 MPa.
The rear adjuster screw acts as a mechanical stop that shortens the effective travel. For this 240 mm stroke model, you can trim the stroke back by up to 30 mm, providing a usable travel window of 210-240 mm.
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