Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50S 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 SAIJ125AX240-50S
The AirTAC SAIJ125X240-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 240mm nominal stroke that can be fine-tuned down by up to 50mm, creating a precise 190-240mm usable travel window. This built-in adjustability allows operators to dial in exact end positions during commissioning without swapping out the entire unit.
This model features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the rear stopper functions strictly as an end-position setter, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50S |
|---|---|
| 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 SAIJ125AX240-50S
| 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 SAIJ125AX240-50S Is Used
Product Size Changeovers
Quickly modify the 190-240mm stroke window to accommodate different product lengths on a packaging line without changing the cylinder.
Machine Setup Calibration
Fine-tune the retracted end position during initial commissioning to achieve precise mechanical alignment for high-force forming operations.
Variable End-Stop Positioning
Utilize the 50mm rear adjustment screw to alter the stopping point for multi-format fixtures in heavy-duty material handling.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX240-50S the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust—such as 6136N push or 5734N pull at 0.5 MPa—but still needs variable end-stops for product changeovers. If your process requires less force, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. Because the 240mm stroke exceeds 200mm, ensure adequate external guiding to prevent excessive side-loading on the rod.
When specifying an ISO 15552 replacement, match the 125mm bore, 240mm stroke, 50mm adjustment range, PT tapered port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. For applications that must hold a load without continuous live air pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster cannot lock the load.
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 SAIJ125AX240-50S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster allows you to shorten the 240mm nominal stroke by up to 50mm, providing a usable travel window of 190-240mm. This stopper sets the end position but does not lock the load without live air pressure.
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