Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-75 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 SAIJ125X240-75
The AirTAC SAIJ125X240-75 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. With a nominal 240 mm stroke and a 75 mm adjustment range, it provides a usable travel window of 165 to 240 mm. This allows you to dial back the retract position precisely at commissioning without swapping the unit or adding external stops. The 125 mm bore delivers 6136 N of push thrust at 0.5 MPa, making it suited for heavy-duty positioning tasks.
The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Because no magnet is specified, you would add an -S suffix if you later need CMSE reed or DMSE electronic sensors. The standard carbon steel rod features an M27x2 thread, and the cylinder uses PT (tapered) G1/2 ports. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-75 |
|---|---|
| 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 SAIJ125X240-75
| 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 SAIJ125X240-75 Is Used
Machine Changeover
Fine-tune the retract end-stop within the 165-240 mm window to accommodate different product sizes on the same line without changing cylinders.
End-Position Calibration
Use the rear adjuster to precisely set the exact retraction point during initial commissioning, absorbing mechanical tolerances in the fixture.
Heavy-Duty Positioning
Leverage the 6136 N push force at 0.5 MPa to move and position heavy pallets or tooling plates, relying on the stopper for travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X240-75 the Right Cylinder?
Choose this adjustable-stroke model over a fixed SAI when your application requires frequent product changeovers or exact end-position tuning within the 165 to 240 mm window. If your thrust requirements are lower, stepping down to a 100 mm bore yields 3927 N of push force at 0.5 MPa, which might better suit lighter loads. For higher force needs, a 160 mm bore provides 10053 N.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 240 mm stroke, 75 mm adjustment, PT G1/2 port, and the desired mounting set. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, intentionally omitting FB, CA, CB, and CR. If your machine requires true load-holding without continuous air pressure, the rear stopper here is not a brake; you should look to an SAIL air-released lock, a BSAI clamp-lock, or an external pilot-operated check valve.
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 SAIJ125X240-75 FAQ
The 125 mm bore generates 6136 N of push thrust and 5734 N of pull thrust at 0.5 MPa. The operational speed range for this bore size is 30-500 mm/s.
The rear adjuster screw acts as a mechanical stop that can shorten the effective stroke by up to 75 mm. This creates a usable travel window of 165 to 240 mm, allowing you to trim the retract distance without replacing the cylinder.
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