Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30 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 SAIJ125AX240-30
The AirTAC SAIJ125X240-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm piston rod with an M27x2 thread. The integrated adjuster allows you to dial back the 240mm nominal stroke by up to 30mm, creating a precise 210-240mm usable travel window for exact end-position tuning during commissioning.
This variant is configured with an SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU is supplied without a magnet. The rear screw functions strictly as a mechanical stop to set the travel end and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30 |
|---|---|
| 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 SAIJ125AX240-30
| 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 SAIJ125AX240-30 Is Used
Heavy Press Fit Tuning
Dial in the exact 210-240mm insertion depth for heavy press-fit operations without changing fixed stops or swapping cylinders.
Product Changeover Stops
Adjust the rear stroke stop on the fly to accommodate different product lengths moving down a high-thrust conveyor line.
Machine Setup Calibration
Fine-tune the end-of-stroke position during initial machine commissioning to prevent mechanical crashes and optimize cycle times.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-30 the Right Cylinder?
Select this 125mm bore actuator when an application requires heavy thrust that exceeds the 3927N push force of a 100mm cylinder, but without stepping up to the larger 160mm frame. The 30mm adjustment window is ideal for product changeovers on a line, allowing you to shift the end stop without physically swapping the cylinder or adding external stops. If your machine requires the piston to hold its position without continuous air pressure, you must integrate an external pilot-operated check valve or select a different AirTAC type like the SAIL or BSAI.
Because the 240mm stroke is below the 300mm threshold, side-load risks are moderate, but the substantial 32mm rod and M27x2 thread provide excellent rigidity and resistance to deflection. For a direct ISO 15552 replacement, match the 125mm bore, 240mm stroke, 30mm adjuster, PT port thread, and required mounting bracket from the SAIJ set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted from this adjustable series.
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 SAIJ125AX240-30 FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster acts as a mechanical stop that lets you shorten the 240mm nominal stroke by up to 30mm, providing a usable travel window of 210-240mm. It sets the end position but does not lock the load without live air pressure.
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